Stop voice note on video playback.

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

@@ -220,6 +220,13 @@ public class VoiceNoteMediaController implements DefaultLifecycleObserver {
     }
   }
 
+  /**
+   * Pauses playback regardless of which audio slide is playing.
+   */
+  public void pausePlayback() {
+    getMediaController().getTransportControls().pause();
+  }
+
   /**
    * Seeks to a given position if th given audio slide is playing. This call
    * is ignored if the given audio slide is not currently playing.