Filter recent rooms as-you-type into the call name box

**Is your feature request related to a problem? Please describe.**
The recent rooms list can get fairly lengthy and difficult to pick out the one you want (especially when the rooms don't have avatars). Typing in the room name box could also filter the list of recent rooms.

**Describe the solution you'd like**
* Arrive on homepage, all recent rooms displayed
* Start typing something into the 'call name' box
* Only recent rooms whose names contain that string are displayed