Fix depth test

Author: ppizarror

test/test_menu.py

@@ -467,10 +467,6 @@ def test_depth(self) -> None:
         """
         menu = MenuUtils.generic_menu(title='mainmenu')
         self.assertEqual(menu._get_depth(), 0)
-        top = menu._top
-        menu._top = None
-        self.assertEqual(menu._get_depth(), 0)
-        menu._top = top
 
         # Adds some menus
         menu_prev = menu