Fix song select favourite button getting stuck spinning if operation failed

[bdach]

Closes #34376

Compare handling with

osu/osu.Game/Overlays/BeatmapSet/Buttons/FavouriteButton.cs

Lines 81 to 85 in 0b45377

	notifications?.Post(new SimpleNotification
	{
	Text = e.Message,
	Icon = FontAwesome.Solid.Times,
	});