Remove unnecessary private field

osu.Game/Rulesets/UI/RulesetContainer.cs

@@ -68,11 +68,10 @@ namespace osu.Game.Rulesets.UI
         /// </summary>
         public Playfield Playfield => playfield.Value;
 
-        private readonly Container overlays;
         /// <summary>
         /// Place to put drawables above hit objects but below UI.
         /// </summary>
-        public Container Overlays => overlays;
+        public readonly Container Overlays;
 
         /// <summary>
         /// The cursor provided by this <see cref="RulesetContainer"/>. May be null if no cursor is provided.
@@ -93,7 +92,7 @@ namespace osu.Game.Rulesets.UI
         {
             Ruleset = ruleset;
             playfield = new Lazy<Playfield>(CreatePlayfield);
-            overlays = new Container
+            Overlays = new Container
             {
                 RelativeSizeAxes = Axes.Both,
                 Width = 1,