Show server details on login for unreachable homeserver
Show server details on login for unreachable homeserver

This fixes the login page to be more helpful when the current homeserver is
unreachable: it reveals the server change field, so you have some chance to
progress forward.

Fixes https://github.com/vector-im/riot-web/issues/11077

matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk