Channel with 2 users has its name treated like a Direct Message

[cyrneko]

Describe the bug

When in a channel with only 2 users, the sidebar and top panel will display the name of the other member, as if it was a direct message

Reproduction

1. Create a (non-dm) channel
2. Invite 1 other person
3. Observe issue

Expected behavior

The channel's actual name should be displayed as is it set in room state.

Platform and versions

- OS: Linux x86_64
- Browser: Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.0
- Sable: v1.19.4 (d8938a6)

Additional context

No response