move stop timer in mediatracksubscriptions module where it belongs (#357)

* move stop timer in mediatracksubscriptions module where it belongs

* Correct my screw up

pkg/rtc/mediatrack.go

@@ -202,7 +202,6 @@ func (t *MediaTrack) AddReceiver(receiver *webrtc.RTPReceiver, track *webrtc.Tra
 		)
 		wr.SetRTCPCh(t.params.RTCPChan)
 		wr.OnCloseHandler(func() {
-			t.stopMaxQualityTimer()
 			t.RemoveAllSubscribers()
 			t.MediaTrackReceiver.Close()
 			t.params.Telemetry.TrackUnpublished(context.Background(), t.PublisherID(), t.ToProto(), uint32(track.SSRC()))

pkg/rtc/mediatrackreceiver.go

@@ -98,6 +98,8 @@ func (t *MediaTrackReceiver) Close() {
 	onclose := t.onClose
 	t.lock.Unlock()
 
+	t.MediaTrackSubscriptions.Close()
+
 	for _, f := range onclose {
 		f()
 	}

pkg/rtc/mediatracksubscriptions.go

@@ -63,6 +63,10 @@ func NewMediaTrackSubscriptions(params MediaTrackSubscriptionsParams) *MediaTrac
 	return t
 }
 
+func (t *MediaTrackSubscriptions) Close() {
+	t.stopMaxQualityTimer()
+}
+
 func (t *MediaTrackSubscriptions) OnNoSubscribers(f func()) {
 	t.onNoSubscribers = f
 }