fix(room_preview): add fallback server names when possible #4357
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If no server names are provided for the room summary request and the room's server name doesn't match the current user's server name, add the room alias/id server name as a fallback value. This seems to fix room preview through federation, when there is a server name in either the room id or alias.
Also, when getting a summary for a room list item, if it's an invite one, add the server name of the inviter's user id as another possible fallback.
Signed-off-by: