fix import middleware testen

api/tests/test_middleware.py

@@ -2,7 +2,7 @@
 from django.contrib.auth.models import User
 from unittest.mock import patch
 from api.models.gebruiker import Gebruiker
-from api.middleware import AuthenticationUserMiddleware
+from api.middleware.middleware import AuthenticationUserMiddleware
 from django.contrib.auth.models import AnonymousUser
 import jwt