Normalise room list font weight, bold unreads

[nadonomy]

Closes #8935.

Before:

After:

[turt2live]

(push to resolve failing build)

[turt2live]

lgtm - did we want this to land before the RC on Wednesday or after?

(also the conversation referenced mentions potentially making it a setting?)

[4nd3r]

also the conversation referenced mentions potentially making it a setting?

please no. there's already enough knobs to turn and bold should be visibly bold.

[nadonomy]

lgtm - did we want this to land before the RC on Wednesday or after?

Pushed this in mind to get it into the RC, it's a simple change but highly requested and will make a lot of people happy.

(also the conversation referenced mentions potentially making it a setting?)

The setting conversation was talking about something else (related to key backup).