fix: casting state on new cast-button

Author: luwes

src/js/media-controller.js

@@ -672,6 +672,11 @@ class MediaController extends MediaContainer {
         MediaUIAttributes.MEDIA_IS_FULLSCREEN,
         this.hasAttribute(MediaUIAttributes.MEDIA_IS_FULLSCREEN)
       );
+      propagateMediaState(
+        [el],
+        MediaUIAttributes.MEDIA_IS_CASTING,
+        this.hasAttribute(MediaUIAttributes.MEDIA_IS_CASTING)
+      );
       propagateMediaState(
         [el],
         MediaUIAttributes.MEDIA_CURRENT_TIME,