Slightly increase brick hitbox

To avoid corner tunneling.

godot/scenes/main.tscn

@@ -22,7 +22,7 @@ extents = Vector2( 300, 50 )
 extents = Vector2( 200, 50 )
 
 [sub_resource type="RectangleShape2D" id=7]
-extents = Vector2( 20, 10 )
+extents = Vector2( 20.5, 10.5 )
 
 [sub_resource type="TileSet" id=6]
 0/name = "brik.png 0"