Remove no longer required AlwaysPresent definition

This also reverts commit 7fedfd368c as
no-longer-necessary.

osu.Game/Screens/OnlinePlay/DailyChallenge/DailyChallengeCarousel.cs

@@ -50,7 +50,6 @@ namespace osu.Game.Screens.OnlinePlay.DailyChallenge
         {
             drawable.RelativeSizeAxes = Axes.Both;
             drawable.Size = Vector2.One;
-            drawable.AlwaysPresent = true;
             drawable.Alpha = 0;
 
             base.Add(drawable);

osu.Game/Screens/OnlinePlay/DailyChallenge/DailyChallengeScoreBreakdown.cs

@@ -27,9 +27,6 @@ namespace osu.Game.Screens.OnlinePlay.DailyChallenge
 
         private FillFlowContainer<Bar> barsContainer = null!;
 
-        // we're always present so that we can update while hidden, but we don't want tooltips to be displayed, therefore directly use alpha comparison here.
-        public override bool PropagatePositionalInputSubTree => base.PropagatePositionalInputSubTree && Alpha > 0;
-
         private const int bin_count = MultiplayerPlaylistItemStats.TOTAL_SCORE_DISTRIBUTION_BINS;
         private long[] bins = new long[bin_count];