The previous commit broke animations of difficulty panels when selecting beatmaps. This commit fixes these.
Doesn't interact well with dialog popups. May add back later with complementing logic.
Also only shows sets with beatmaps for current play mode.
# Conflicts: # osu.Desktop.VisualTests/osu.Desktop.VisualTests.csproj # osu.Game/Screens/Select/PlaySongSelect.cs # osu.Game/osu.Game.csproj