ref(video-layout): consolidate connection status update handling (#3185)

- Instead of having 4 listeners for local connection status
  updates and 1 for remote, remove two of the redundant listeners.
- Instead of calling into 4 separate VideoLayout methods to update a
  participant's connection status, expose one handler.

react/features/video-layout/middleware.web.js

@@ -53,7 +53,8 @@ MiddlewareRegistry.register(store => next => action => {
         // explicit in order to minimize changes to other code.
         if (typeof action.participant.connectionStatus !== 'undefined') {
             VideoLayout.onParticipantConnectionStatusChanged(
-                action.participant.id);
+                action.participant.id,
+                action.participant.connectionStatus);
         }
         break;
     }