Fix usages of CircularContainer in line with framework changes.

osu.Game.Modes.Osu/Objects/Drawables/Pieces/NumberPiece.cs

@@ -29,6 +29,8 @@ public NumberPiece()
             {
                 new CircularContainer
                 {
+                    Masking = true,
+                    Origin = Anchor.Centre,
                     EdgeEffect = new EdgeEffect
                     {
                         Type = EdgeEffectType.Glow,

osu.Game.Modes.Osu/Objects/Drawables/Pieces/SpinnerDisc.cs

@@ -61,6 +61,7 @@ private void layout()
                     {
                         Colour = Color4.White,
                         RelativePositionAxes = Axes.Both,
+                        Masking = true,
                         Origin = Anchor.Centre,
                         Size = new Vector2(1 / ScreenSpaceDrawQuad.Width * 2000),
                         Children = new[]

osu.Game/Graphics/UserInterface/Nub.cs

@@ -30,6 +30,8 @@ public Nub()
             BorderColour = Color4.White;
             BorderThickness = border_width;
 
+            Masking = true;
+
             Children = new[]
             {
                 fill = new Box

osu.Game/Graphics/UserInterface/OsuPasswordTextBox.cs

@@ -28,6 +28,8 @@ public PasswordMaskChar(float size)
                     circle = new CircularContainer
                     {
                         Anchor = Anchor.Centre,
+                        Origin = Anchor.Centre,
+                        Masking = true,
                         Alpha = 0,
                         RelativeSizeAxes = Axes.Both,
                         Size = new Vector2(0.8f, 0),

osu.Game/Overlays/Dialog/PopupDialog.cs

@@ -193,6 +193,7 @@ public PopupDialog()
                                         {
                                             Origin = Anchor.Centre,
                                             Anchor = Anchor.Centre,
+                                            Masking = true,
                                             BorderColour = Color4.White,
                                             BorderThickness = 5f,
                                             Children = new Drawable[]

osu.Game/Screens/Menu/OsuLogo.cs

@@ -91,8 +91,10 @@ public OsuLogo()
                                         logoContainer = new CircularContainer
                                         {
                                             Anchor = Anchor.Centre,
+                                            Origin = Anchor.Centre,
                                             RelativeSizeAxes = Axes.Both,
                                             Scale = new Vector2(0.8f),
+                                            Masking = true,
                                             Children = new Drawable[]
                                             {
                                                 colourAndTriangles = new Container