Set which servers to try and join upgraded rooms through
Set which servers to try and join upgraded rooms through

Fixes https://github.com/vector-im/riot-web/issues/7991
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