Reduce delay before loading beatmap after selection change at song select

This was originally set high because of performance concerns. We have
since improved things quite drastically. Even with a very low debounce
my song select is amazingly smooth.

This is about as low as we can got unless we want chaos when key
repeating left/right arrows (it's not as bad as you think, maybe worth
testing during review and see if it feels more expected?).

Of note, stable has key repeat disabled on left/right arrows and zero
debounce.

Addresses concerns in https://github.com/ppy/osu/discussions/24916.

osu.Game/Screens/Select/SongSelect.cs

@@ -525,7 +525,11 @@ namespace osu.Game.Screens.Select
             if (beatmapInfoNoDebounce == null)
                 run();
             else
-                selectionChangedDebounce = Scheduler.AddDelayed(run, 200);
+            {
+                // Intentionally slightly higher than repeat_tick_rate to avoid loading songs when holding left / right arrows.
+                // See https://github.com/ppy/osu-framework/blob/master/osu.Framework/Input/InputManager.cs#L44
+                selectionChangedDebounce = Scheduler.AddDelayed(run, 80);
+            }
 
             if (beatmap?.Equals(beatmapInfoPrevious) != true)
             {