Bounce the ball on screen instead of Offscreen at the bottom and right (#57)

* Prevent the sprite from going off screen

Its just a simple visual yet neat thing to have :3

* fix trivial pet-peeve

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Co-authored-by: George Kurelic <[email protected]>

Author: TracedInPurple

demos/states/flxsubstate/source/PlayState.hx

@@ -46,11 +46,11 @@ class PlayState extends FlxState
 	{
 		super.update(elapsed);
 
-		if (sprite.x < 0 || sprite.x > FlxG.width)
+		if (sprite.x < 0 || sprite.x + sprite.width > FlxG.width)
 		{
 			sprite.velocity.x *= -1;
 		}
-		if (sprite.y < 0 || sprite.y > FlxG.height)
+		if (sprite.y < 0 || sprite.y + sprite.height > FlxG.height)
 		{
 			sprite.velocity.y *= -1;
 		}