fix(caldav): Do not overwrite shared calendar owner #45054
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Summary
Sabre invitation plugin skip invites if the organizer of the event is not the owner of the calendar. That happens for shared calendars because \OCA\DAV\CalDAV\Calendar::getOwner overwrites \Sabre\CalDAV\Calendar::getOwner. Upstream returns the principaluri of the owner, we return the principaluri of the sharee.
Want to test if this revives the invites in shared calendars. Adjustments for other places that use the getOwner method might be required.