Add roles to create_user test (#20773)

Flask App Builder 3.4.3 made role and conf_password obligatory
when creating user:
dpgaspar/Flask-AppBuilder#1758

Our test for user creation did not have the role set (though the
UI used it and the cient also allows to set it).

This change adds the `roles` in our tests to enable upgrade
to FAB 3.4.3 for the CI (currently tests in main fail because of
the test failure)

(cherry picked from commit a1a32f7)

tests/www/views/test_views_base.py

@@ -325,6 +325,7 @@ def test_create_user(app, admin_client, non_exist_username):
             'last_name': 'fake_last_name',
             'username': non_exist_username,
             'email': 'fake_email@email.com',
+            'roles': [1],
             'password': 'test',
             'conf_password': 'test',
         },