Remove admin user from test data

fixtures/highschool-de-20212022.json

@@ -3783,24 +3783,6 @@
             "permissions": []
         }
     },
-    {
-        "model": "auth.user",
-        "pk": 1,
-        "fields": {
-            "password": "pbkdf2_sha256$260000$pNXsZz3HeW71ShBhoY7Wf0$K58u42VTcV7fohapUNmt7ch+/pDPPk1LPao2+DQPquE=",
-            "last_login": "2021-10-12T16:25:05.362Z",
-            "is_superuser": true,
-            "username": "admin",
-            "first_name": "Admin",
-            "last_name": "istrator",
-            "email": "",
-            "is_staff": true,
-            "is_active": true,
-            "date_joined": "2021-10-06T18:37:50.428Z",
-            "groups": [],
-            "user_permissions": []
-        }
-    },
     {
         "model": "auth.user",
         "pk": 2,