Fix typos and simplification

app/admin/json_routes.py

@@ -14,10 +14,10 @@ def update_user_role(user_id):
     user = User.query.get_or_404(user_id)
     user.confirmed = confirmed
     db.session.commit()
-    resonse_data = {
+    response_data = {
         'message': (
             f'User "{user.username}" is now '
             f'{"confirmed" if confirmed else "unconfirmed"}'
         )
     }
-    return resonse_data, 200
+    return response_data, 200