Description:

Direct messages get deleted, even though "Message Erasure Type" is set to "Keep Messages and User Name".
"Message Erasure Type" not working for direct messages.

Steps to reproduce:

1. As an admin, set "Message Erasure Type" to "Keep Messages and User Name" under "Message"
2. Create a User
3. Start a direct message with this user
4. Delete the User

Expected behavior:

I'd expect all messages with the deleted account would remain.

Actual behavior:

When an account is deleted, all direct messages with the user will be deleted.
Messages in channels or rooms will remain (as expected)

Server Setup Information:

• Version of Rocket.Chat Server: 3.15.0
• Operating System: Centos 7
• Deployment Method: docker
• Number of Running Instances: 1
• DB Replicaset Oplog: enable
• NodeJS Version: v12.22.1
• MongoDB Version: 4.0.23

Client Setup Information

Desktop App or Browser Version: Happens in both
Operating System: Windows / Linux / All

Additional context

We need keep direct messages when user delete

Relevant logs: