Fix EditorObjectSelector popup size

Author: Giganzo

editor/gui/editor_object_selector.cpp

@@ -99,10 +99,7 @@ void EditorObjectSelector::_show_popup() {
 	Point2 gp = get_screen_position();
 	gp.y += size.y;
 
-	sub_objects_menu->set_position(gp);
-	sub_objects_menu->set_size(Size2(size.width, 1));
-
-	sub_objects_menu->popup();
+	sub_objects_menu->popup(Rect2(gp, Size2(size.width, 0)));
 }
 
 void EditorObjectSelector::_about_to_show() {