Description:

When RocketChat is running in subdir, channel avatar in sidebar is not shown.

Steps to reproduce:

1. start docker with environment: ROOT_URL=http://localhost:3000/chat
2. create public/private groups
3. show sidebar

Expected behavior:

Actual behavior:

Server Setup Information:

• Version of Rocket.Chat Server: 0.69.0
• Operating System: Ubuntu 16.04.5
• Deployment Method: docker
• Number of Running Instances: 1
• DB Replicaset Oplog:
• NodeJS Version:
• MongoDB Version: