fix(music-controls): fix return types for methods

src/plugins/music-controls.ts

@@ -137,13 +137,13 @@ export class MusicControls {
    * Toggle play/pause:
    * @param isPlaying {boolean}
    */
-  @Cordova({sync: true})
+  @Cordova()
   static updateIsPlaying(isPlaying: boolean): void {}
 
   /**
    * Toggle dismissable:
    * @param dismissable {boolean}
    */
-  @Cordova({sync: true})
+  @Cordova()
   static updateDismissable(dismissable: boolean): void {}
 }