Cannot change ipv6-cidr in daemon.json anymore - dockerd fails to start

### Description

hello,

i try to reconfigure my docker default bridge, but after i used
```
{
  "ipv6": true,
  "fixed-cidr-v6": "fe80::/64",
  "ip6tables": true,
  "experimental": true
}
```
in daemon.json, its created ipv6 addres on docker0, but when i want to change the cidr in daemon.json, i cannot restart via systemctl restart docker. it fails with
```
Nov 17 17:36:05 gbc dockerd[8448]: time="2023-11-17T17:36:05.968731732+01:00" level=info msg="Loading containers: start."
Nov 17 17:36:06 gbc dockerd[8448]: time="2023-11-17T17:36:06.381431577+01:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon option --bip can be used to set a preferred IP address"
Nov 17 17:36:06 gbc dockerd[8448]: time="2023-11-17T17:36:06.382374332+01:00" level=info msg="stopping event stream following graceful shutdown" error="<nil>" module=libcontainerd namespace=moby
Nov 17 17:36:06 gbc dockerd[8448]: failed to start daemon: Error initializing network controller: error creating default "bridge" network: failed to add IPv6 address fe80::1/80 to bridge: file exists
Nov 17 17:36:06 gbc systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
```
i tried to forcefully remove via "sudo rm /var/lib/docker/network/files/local-kv.db", the folder is empty, but dockerd --debug still spits out the same error that the file exists.
after reediting the daemon.json to the old /64 cidr, restarting works again.

regards

### Reproduce

1. edit daemon.json to 
```
{
  "ipv6": true,
  "fixed-cidr-v6": "fe80::/64",
  "ip6tables": true,
  "experimental": true
}
```
2. restart docker
3. reedit daemon.json, change cidr like /80
4. try to restart via systemctl restart docker

### Expected behavior

_No response_

### docker version

```bash
Client: Docker Engine - Community
 Version:           24.0.7
 API version:       1.43
 Go version:        go1.20.10
 Git commit:        afdd53b
 Built:             Thu Oct 26 09:08:02 2023
 OS/Arch:           linux/amd64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          24.0.7
  API version:      1.43 (minimum version 1.12)
  Go version:       go1.20.10
  Git commit:       311b9ff
  Built:            Thu Oct 26 09:08:02 2023
  OS/Arch:          linux/amd64
  Experimental:     true
 containerd:
  Version:          1.6.24
  GitCommit:        61f9fd88f79f081d64d6fa3bb1a0dc71ec870523
 runc:
  Version:          1.1.9
  GitCommit:        v1.1.9-0-gccaecfc
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0
```


### docker info

```bash
Version:    24.0.7
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.11.2
    Path:     /usr/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.21.0
    Path:     /usr/libexec/docker/cli-plugins/docker-compose

Server:
 Containers: 11
  Running: 11
  Paused: 0
  Stopped: 0
 Images: 24
 Server Version: 24.0.7
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 61f9fd88f79f081d64d6fa3bb1a0dc71ec870523
 runc version: v1.1.9-0-gccaecfc
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.1.0-13-amd64
 Operating System: Debian GNU/Linux 12 (bookworm)
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 31.08GiB
 Name: gbc
 ID: a13438fe-d85c-4149-886b-05d2850e11e4
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: true
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false
```


### Additional Info

on my older local machine with debian 12 repo docker, i can change the cidr as-i-wish and restart wihtout a problme.

```
Client:
 Version:           20.10.24+dfsg1
 API version:       1.41
 Go version:        go1.19.8
 Git commit:        297e128
 Built:             Thu May 18 08:38:34 2023
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server:
 Engine:
  Version:          20.10.24+dfsg1
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.19.8
  Git commit:       5d6db84
  Built:            Thu May 18 08:38:34 2023
  OS/Arch:          linux/amd64
  Experimental:     true
 containerd:
  Version:          1.6.20~ds1
  GitCommit:        1.6.20~ds1-1+b1
 runc:
  Version:          1.1.5+ds1
  GitCommit:        1.1.5+ds1-1+b1
 docker-init:
  Version:          0.19.0
  GitCommit:
```
```
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc., v0.11.2)
  compose: Docker Compose (Docker Inc., v2.21.0)

Server:
 Containers: 20
  Running: 18
  Paused: 0
  Stopped: 2
 Images: 44
 Server Version: 20.10.24+dfsg1
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 1.6.20~ds1-1+b1
 runc version: 1.1.5+ds1-1+b1
 init version:
 Security Options:
  apparmor
  seccomp
   Profile: default
  cgroupns
 Kernel Version: 6.1.0-13-amd64
 Operating System: Debian GNU/Linux 12 (bookworm)
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 14.47GiB
 Name: debian-svr
 ID: NYSZ:IIV3:YFGV:N4P6:HDDA:ZUES:WA7W:UVKX:TAVP:3INY:X7QQ:7UFQ
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: true
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false
```


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Cannot change ipv6-cidr in daemon.json anymore - dockerd fails to start #46829

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Cannot change ipv6-cidr in daemon.json anymore - dockerd fails to start #46829

Description

Description

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docker version

docker info

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