Remove unnecessary collapse call from BeatmapCard

This is already handled at the `BeatmapCardContent` level. This call
actually causes the buggy behaviour reported in
https://github.com/ppy/osu/discussions/16085.

osu.Game/Beatmaps/Drawables/Cards/BeatmapCard.cs

@@ -368,8 +368,6 @@ namespace osu.Game.Beatmaps.Drawables.Cards
 
         protected override void OnHoverLost(HoverLostEvent e)
         {
-            content.CollapseAfterDelay();
-
             updateState();
             base.OnHoverLost(e);
         }