Update mod columns even if they're not present/offscreen

Important to make "select/deselect all" operations work on all columns
simultaneously, even if they're offscreen. Unfortunately by the nature
of how the existing selection animation works, it is hard-tied to the
update loop, so we need to compensate.

osu.Game/Overlays/Mods/ModColumn.cs

@@ -399,7 +399,7 @@ namespace osu.Game.Overlays.Mods
 
         private readonly Queue<Action> pendingSelectionOperations = new Queue<Action>();
 
-        protected bool SelectionAnimationRunning => pendingSelectionOperations.Count > 0;
+        internal bool SelectionAnimationRunning => pendingSelectionOperations.Count > 0;
 
         protected override void Update()
         {