* fix(thumbnail): Optimize status bar moderator icon

Moved all moderator functionality to react to optimize the number of
status bar updates.

* fix(RemoteVideoMenuTriggerButton): Use nullish coalescing

Co-Authored-By: Saúl Ibarra Corretgé <saghul@jitsi.org>

* ref(StatusBar): rename to StatusIndicators

* fix(RemoteVideoMenu): isModerator value.

* fix(notification): mobile.

Co-authored-by: Saúl Ibarra Corretgé <s@saghul.net>

Join notifications are already supressed for the local
participant, so hide the left notification. For now
the notification is not being shown on mobile to keep
the same existing behavior and because a copy change
will be needed, but will be added once batching is
implemented.