Fix "flask shell" not working on PaaS instances
Fix "flask shell" not working on PaaS instances

This is consistent with API [1]. Other apps don't need this as they
follow the Flask convention of it being the "app" module or package.

[1]: https://github.com/alphagov/notifications-api/blob/master/manifest.yml.j2#L112

alphagov/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin