Fix conditions for showing presence and payment on the event page

Closes no issue (issue reported in the Thalia Whatsapp)

Previous behaviour

Steps to reproduce:

1. Create an event which requires registration.
2. Register and unregister for the event.
3. It still shows the payment status and presence.

New behaviour

Steps to validate that it works:

1. Create an event which requires registration.
2. Register and unregister for the event.
3. It no longer shows the payment status and presence.