Restrict changing registrations to organiser

Ghost Userrequested to merge
fix/change-registrations into master

Closes #786

Previous behaviour

Steps to reproduce:

  1. Create an user without super user
  2. Add this user to a committee which is allowed to organize events.
  3. Create a registration for an event organized by a different committee.
  4. Notice that the user can see and change the registrations for the event of the other committee.

New behaviour

Steps to validate that it works:

  1. Create an user without super user
  2. Add this user to a committee which is allowed to organize events.
  3. Create a registration for an event organized by a different committee.
  4. Notice that the user can no longer see and change the registrations for the event of the other committee.
Edited by Ghost User

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