Detach favourites from playlists again

[Simon5Six7]

Hey :D Previously it used to show in the all songs tab which songs were added to favourites in the past and it doesn't do that anymore. It's happened a few times now that I've doubeld songs in my favourites list without knowing and then later having to clean up again. I feel like favourites should get a little better treatment than regular playlists. That is all, otherwise greatly enjoying the plugin, thank you <3