Mute mics by default (#2754)

This adds a setting to mute mics by default.

fixes https://github.com/zed-industries/community/issues/1769

Release notes:

- Fixed a bug with gutter spacing on files that end on a new significant
digit
- Added a setting for muting on join, and set it to true by default.

crates/live_kit_client/examples/test_app.rs

@@ -63,7 +63,7 @@ fn main() {
             let audio_track = LocalAudioTrack::create();
             let audio_track_publication = room_a.publish_audio_track(&audio_track).await.unwrap();
 
-            if let RemoteAudioTrackUpdate::Subscribed(track) =
+            if let RemoteAudioTrackUpdate::Subscribed(track, _) =
                 audio_track_updates.next().await.unwrap()
             {
                 let remote_tracks = room_b.remote_audio_tracks("test-participant-1");