Mute shortcuts don't work in the lobby

### Steps to reproduce

1. Enter the lobby of a call (eg. click on an entry in the recents list from the homepage)
2. Press 'm' or 'v' on the keyboard

### Outcome

#### What did you expect?
Video / audio mute state toggled

#### What happened instead?
Nothing

We should probably wire these up so they work on the lobby screen.

### Operating system

_No response_

### Browser information

_No response_

### URL for webapp

_No response_

### Will you send logs?

No