Fix debug renderEntities when entity's scroll is != 1

Fix the hitbox's rectangle in debug mode when the default value of an entity's scroll has been changed. Without it, the debug rectangle has a wrong offset.

Here's an entity example if you want to quickly see it yourself :
```
package ;

import com.haxepunk.Entity;
import com.haxepunk.graphics.Image;
import nme.display.BitmapData;

class EntityExample extends Entity
{
	public function new(x:Float=0, y:Float=0) 
	{
		super(x, y);
		graphic = new Image(new BitmapData(32, 32));
		setHitbox(32, 32);
		graphic.scrollX = 0;
		graphic.scrollY = 0;
	}
}
```