Public Access: login button not available after logout from meeting

[MSoeb]

Describe the bug
If you log out of a meeting, the button for public access is missing in the login screen. This is because the URL still contains the meeting.

How to Reproduce
Steps to reproduce the behavior:

1. Activate in orga settings the public access
2. open a meeting
3. logout from the meeting
4. -> button is missing

Expected behavior
When logging out of a meeting, you should be redirected to the instance url.

If this is not an option or leads to problems, a login button for public access should be available on the meeting subpages.

[MSoeb]

The issue has a connection to #4281

[reiterl]

I can reproduce this with a meeting which is public and another non-public meeting, from which I logout.
We had the discussion about the login URL after the logout of a meeting. This is another side effect, which should not be relevant in production. Won't fix? @rrenkert please look at this.

[MSoeb]

FYI @reiterl @rrenkert : Did I get it right, that this should not happen in production instances? If yes, this isn't the case. I've tried it on a live instance and the button is still missing after logout from a meeting. I think in general the missing redirection to the instance URL after logout is the problem.

[rrenkert]

@reiterl Can you please have a look? as @MSoeb mentioned this dows not only happen in dev mode but also in production.

[reiterl]

This failure seems to be a side effect of the meeting-id in the login URL. Yes, if someone switches between meetings in a conference and wants to use the public access, this can happen. @rrenkert : next week @bastianjoel can tell you the reasons, why we build this meeting-id in the URL and/or perhaps fix this issue.