feat(toolbox): restore emitting UI events for legacy code

react/features/toolbox/components/AudioMuteButton.js

 import { AbstractAudioMuteButton } from '../../base/toolbox';
 import type { AbstractButtonProps } from '../../base/toolbox';
 import { isLocalTrackMuted } from '../../base/tracks';
+import UIEvents from '../../../../service/UI/UIEvents';
 
 declare var APP: Object;
 
     _setAudioMuted(audioMuted: boolean) {
         sendAnalytics(createToolbarEvent(AUDIO_MUTE, { enable: audioMuted }));
         this.props.dispatch(setAudioMuted(audioMuted));
+
+        // FIXME: The old conference logic as well as the shared video feature
+        // still rely on this event being emitted.
+        typeof APP === 'undefined'
+            || APP.UI.emitEvent(UIEvents.AUDIO_MUTED, audioMuted, true);
     }
 }
 

react/features/toolbox/components/VideoMuteButton.js

 import { AbstractVideoMuteButton } from '../../base/toolbox';
 import type { AbstractButtonProps } from '../../base/toolbox';
 import { isLocalTrackMuted } from '../../base/tracks';
+import UIEvents from '../../../../service/UI/UIEvents';
 
 declare var APP: Object;
 
                 videoMuted,
                 VIDEO_MUTISM_AUTHORITY.USER,
                 /* ensureTrack */ true));
+
+        // FIXME: The old conference logic still relies on this event being
+        // emitted.
+        typeof APP === 'undefined'
+            || APP.UI.emitEvent(UIEvents.VIDEO_MUTED, videoMuted, true);
     }
 }