Fix file upload when modifying registration in a protected event #5719
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When the event is protected and the user just accesses it via its registration token (e.g. because the user was originally logged in or used an access key to access the event), the file upload endpoint still enforced the access check, causing file uploads to fail.
Now we pass the registration token there as well and thus skip the access check when the endpoint is accessed in the context of an existing registration.