Don't allow changing backend in existing server.

Andreas Henningsrequested to merge
meeting-server-lock-backend into main

@AaronGilMartinez This needs a thorough review from you.

Especially:

  • The form may contain logic related to changing backend that is no longer needed.
  • I removed and moved some parts of the test, maybe I removed too much.

I could look more closely, but I think you are the best to judge this.

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