Fix creating orders for other users using the pizza API
Previous behaviour
Steps to reproduce:
- Be an admin and have an active pizza event + products.
- Create a new order for a user that is not you using the API.
- The order is created for you.
New behaviour
Steps to validate that it works:
- Be an admin and have an active pizza event + products.
- Create a new order for a user that is not you using the API.
- The order is created for the specified user.