If initial load occurs offline, rooms and users in the left panel never display image avatars.

**Describe the bug**
If you launch Hydrogen offline, it can't load images, and falls back to using colors and letter names. However, once you go online, it should be able to retrieve these images; it displays the proper avatar in the room view itself, but the left panel remains colors-and-letters no matter what you do.

It's not a serious bug (can be fixed with refresh), but I still think this isn't intended.

**To Reproduce**
Steps to reproduce the behavior:
1. Clear your browser cache (otherwise images won't fail to load in the first place)
2. Disconnect from the internet
3. Refresh Hydrogen
4. Reconnect to the internet

**Expected behavior**
Room regain their proper avatars when the network reconnects.

**Screenshots**

**Desktop:**
- OS: Linux
- Browser Firefox
- Version 89.0.2