Return publication of Track.Source.Unknown in getTrack (#619)

* Return publication of Track.Source.Unknown in getTrack

* Create .changeset/soft-bikes-lick.md

Author: lukasIO

.changeset/soft-bikes-lick.md

@@ -0,0 +1,5 @@
+---
+"livekit-client": minor
+---
+
+Return publication of Track.Source.Unknown in getTrack

src/room/participant/Participant.ts

@@ -92,9 +92,6 @@ export default class Participant extends (EventEmitter as new () => TypedEmitter
    * @returns
    */
   getTrack(source: Track.Source): TrackPublication | undefined {
-    if (source === Track.Source.Unknown) {
-      return;
-    }
     for (const [, pub] of this.tracks) {
       if (pub.source === source) {
         return pub;