use passed in player to access controlbar instead for airplay

webroot/js/components/player.js

@@ -243,7 +243,7 @@ class OwncastPlayer {
           },
         });
 
-        var concreteButtonInstance = this.vjsPlayer.controlBar.addChild(
+        var concreteButtonInstance = player.controlBar.addChild(
           new concreteButtonClass()
         );
         concreteButtonInstance.addClass('vjs-airplay');