[Sound Panel] Fix bugs for sound panel slice

1. notify item change when slice live data has update
2. keep showing Output Switcher slice when media state is in "Pause"
   state

Bug: 247043239
Bug: 238715094
Bug: 204165377
Test: verified on device
Change-Id: Ic56a70f2f2835231519e2fccf0d2e649d41b106e

src/com/android/settings/media/MediaOutputUtils.java

@@ -64,7 +64,9 @@ public class MediaOutputUtils {
                         + ", play back type : " + pi.getPlaybackType() + ", play back state : "
                         + playbackState.getState());
             }
-            if (playbackState.getState() != PlaybackState.STATE_PLAYING) {
+            if (playbackState.getState() == PlaybackState.STATE_STOPPED
+                    || playbackState.getState() == PlaybackState.STATE_NONE
+                    || playbackState.getState() == PlaybackState.STATE_ERROR) {
                 // do nothing
                 continue;
             }