Match muted behavior with JS SDK (#32)

* attempt 1

* implement

* clean up

* clean up

* cleaner code

* mute was opposite

* fix suggestion

* fix local pub muted

* update example

* update pubs

* format

lib/src/participant/local_participant.dart

@@ -247,15 +247,16 @@ extension LocalParticipantTrackSourceExt on LocalParticipant {
   }
 
   Future<void> setSourceEnabled(TrackSource source, bool enabled) async {
-    final pub = getTrackPublicationBySource(source);
+    logger.fine('setSourceEnabled(source: $source, enabled: $enabled)');
+    final pub = getTrackPublicationBySource(source) as LocalTrackPublication?;
     if (pub != null) {
       if (enabled) {
-        pub.muted = false;
+        await pub.unmute();
       } else {
         if (source == TrackSource.screenShareVideo) {
           await unpublishTrack(pub.sid);
         } else {
-          pub.muted = true;
+          await pub.mute();
         }
       }
     } else if (enabled) {

lib/src/participant/participant.dart

@@ -1,5 +1,4 @@
 import 'package:collection/collection.dart';
-import 'package:livekit_client/src/track/track.dart';
 import 'package:meta/meta.dart';
 
 import '../events.dart';
@@ -8,6 +7,7 @@ import '../logger.dart';
 import '../managers/event.dart';
 import '../proto/livekit_models.pb.dart' as lk_models;
 import '../support/disposable.dart';
+import '../track/track.dart';
 import '../track/track_publication.dart';
 import '../types.dart';
 import 'remote_participant.dart';
@@ -199,6 +199,11 @@ extension ParticipantTrackSourceExt on Participant {
         true);
   }
 
+  bool isScreenShareEnabled() {
+    return !(getTrackPublicationBySource(TrackSource.screenShareVideo)?.muted ??
+        true);
+  }
+
   /// Find a track publication by its [TrackSource]
   TrackPublication? getTrackPublicationBySource(TrackSource source) {
     if (source == TrackSource.unknown) return null;

lib/src/participant/remote_participant.dart

@@ -98,8 +98,7 @@ class RemoteParticipant extends Participant {
     }
 
     await track.start();
-
-    pub.track = track;
+    await pub.updateTrack(track);
     addTrackPublication(pub);
 
     [events, roomEvents].emit(TrackSubscribedEvent(