Monkey Pong: fix case of Normalized

This was changed between 3.0-alpha2 and 3.0-beta1.

mono/monkey_pong/Paddle.cs

@@ -28,7 +28,7 @@ public class Paddle : Area2D
         if (area is Ball ball)
         {
             // Assign new direction
-            ball.direction = new Vector2(ballDir, (float)new Random().NextDouble() * 2 - 1).normalized();
+            ball.direction = new Vector2(ballDir, (float)new Random().NextDouble() * 2 - 1).Normalized();
         }
     }
 }