Remove maintain_default_data for custom menus

because custom menus are created automatically if a page is opened

aleksis/core/models.py

@@ -536,12 +536,6 @@ class CustomMenu(ExtensibleModel):
     def __str__(self):
         return self.name if self.name != "" else self.id
 
-    @classmethod
-    def maintain_default_data(cls):
-        menus = ["footer"]
-        for menu in menus:
-            cls.get_default(menu)
-
     @classmethod
     def get_default(cls, name):
         menu, _ = cls.objects.get_or_create(id=name, defaults={"name": name})