refactor: correction d'un test fragile (#848)

## Description

🎸 `TestSendMagicLink`

## Type de changement

🚧 technique

### Points d'attention

🦺 forcer le token à `fixed-token` pour tester son affichage

lacommunaute/users/tests/tests_views.py

@@ -86,7 +86,9 @@ def validate_magiclink_payload(payload_as_str, uidb64, token, expected):
 
 class TestSendMagicLink:
     @pytest.mark.parametrize("env,count_msg", [(Environment.PROD, 0), (Environment.DEV, 1)])
-    def test_send_magic_link(self, db, user, snapshot, mock_respx_post_to_sib_smtp_url, env, count_msg):
+    def test_send_magic_link(
+        self, db, user, snapshot, mock_token_generator, mock_respx_post_to_sib_smtp_url, env, count_msg
+    ):
         with override_settings(ENVIRONMENT=env):
             next_url = "/topics/"
             request = RequestFactory().get("/")