Authorization via direct entry is buggy
If user is logged in as creator and then joins a session via URL the users access will not be corrected. See https://git.thm.de/arsnova/frag.jetzt/merge_requests/249.
If user is logged in as creator and then joins a session via URL the users access will not be corrected. See https://git.thm.de/arsnova/frag.jetzt/merge_requests/249.