Fix check user is a superuser. (#905)

Co-authored-by: wlorenzetti <lorenzett@gis3w.it>
(cherry picked from commit 171ec89)

g3w-admin/usersmanage/api/permissions.py

@@ -21,5 +21,5 @@ class IsAdminOrEditor1User(BasePermission):
     """
 
     def has_permission(self, request, view):
-        return (bool(request.user and request.user.is_staff) or
+        return (bool(request.user and request.user.is_superuser) or
                 userHasGroups(request.user, [G3W_EDITOR1]))