Make Shape render properly again.

src/Avalonia.Controls/Shapes/Shape.cs

@@ -64,7 +64,7 @@ namespace Avalonia.Controls.Shapes
                     if (DefiningGeometry != null)
                     {
                         _renderedGeometry = DefiningGeometry.Clone();
-                        ////_renderedGeometry.Transform = new MatrixTransform(_transform);
+                        _renderedGeometry.Transform = new MatrixTransform(_transform);
                     }
                 }
 

tests/Avalonia.Visuals.UnitTests/VisualTree/MockRenderInterface.cs

@@ -51,18 +51,7 @@ namespace Avalonia.Visuals.UnitTests.VisualTree
 
             public Rect Bounds => _impl.CalculateBounds();
 
-            public Matrix Transform
-            {
-                get
-                {
-                    throw new NotImplementedException();
-                }
-
-                set
-                {
-                    throw new NotImplementedException();
-                }
-            }
+            public Matrix Transform { get; set; }
 
             public IStreamGeometryImpl Clone()
             {