Fix cast media player browser (#39745)

homeassistant/components/cast/media_player.py

@@ -510,7 +510,7 @@ class CastDevice(MediaPlayerEntity):
     async def async_browse_media(self, media_content_type=None, media_content_id=None):
         """Implement the websocket media browsing helper."""
         result = await media_source.async_browse_media(self.hass, media_content_id)
-        return result.to_media_player_item()
+        return result
 
     async def async_play_media(self, media_type, media_id, **kwargs):
         """Play a piece of media."""