uwsgi-python: fix redeleitsystem database migrations command

uwsgi-python/tasks/apps/redeleitsystem.yml

@@ -9,7 +9,7 @@
     group: "{{app_group}}"
 
 - name: ensure data model upgrades are applied  # noqa 301
-  command: "{{app_venv}}/bin/python {{app_path}}/server.py db upgrade"
+  command: "{{app_venv}}/bin/flask db upgrade"
   args:
     chdir: "{{app_path}}"
   become: true