Remove outwards exposure of mute property

osu.Game/Graphics/UserInterface/Volume/VolumeControl.cs

@@ -86,7 +86,7 @@ public bool Adjust(GlobalAction action)
                     return true;
                 case GlobalAction.ToggleMute:
                     Show();
-                    Muted = !Muted;
+                    muted.Toggle();
                     return true;
             }
 
@@ -103,12 +103,6 @@ private void volumeChanged(double newVolume)
 
         private readonly BindableBool muted = new BindableBool();
 
-        public bool Muted
-        {
-            get => muted.Value;
-            set => muted.Value = value;
-        }
-
         [BackgroundDependencyLoader]
         private void load(AudioManager audio)
         {