remove a bunch of unused assignments

hacked-libtiled/tiled/core/MapObject.java

@@ -43,7 +43,7 @@ public class MapObject implements Cloneable
 {
     private Properties properties = new Properties();
     private ObjectGroup objectGroup;
-    private Rectangle bounds = new Rectangle();
+    private Rectangle bounds;
     private String name = "Object";
     private String type = "";
     private String imageSource = "";