Do not crash when we try to play from IDLE state.

app/src/main/java/org/thoughtcrime/securesms/components/voice/VoiceNotePlaybackPreparer.java

@@ -69,7 +69,7 @@ final class VoiceNotePlaybackPreparer implements MediaSessionConnector.PlaybackP
 
   @Override
   public void onPrepare(boolean playWhenReady) {
-    throw new UnsupportedOperationException("VoiceNotePlaybackPreparer does not support onPrepare");
+    Log.w(TAG, "Requested playback from IDLE state. Ignoring.");
   }
 
   @Override