Fix favicons
Description
The admin console shows favicons for federated domains.
For many domains, the favicons currently are not displayed, even though they're available. Messages like these are logged:
There seem to be at least two (potentially more) different issues. The jabber.de favicon is accessible only after following a redirect from HTTP to HTTPS. I'm unsure why the doomsong.co.uk favicon isn't being displayed (there does not seem to be a redirect).
Environment
None
Fixed
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