modules/world: fix scalling function

actually adding the scaling would be nice.

gamecore/modules/world/actors/actor2D.lua

@@ -175,10 +175,14 @@ end
 
 function Actor2D:setSpriteScallingX(sx)
   local sx = sx or 1
+
+  self.sprite.sx = sx
 end
 
 function Actor2D:setSpriteScallingY(sy)
   local sy = sy or 1
+
+  self.sprite.sy = sy
 end
 
 function Actor2D:drawSprite(x, y, r, sx, sy, ox, oy, kx, ky)