support channel names with slash in name/alias
support channel names with slash in name/alias

Signed-off-by: Jan Gerber <5c2dd944dde9e08881bef0894fe7b22a5c9c4b06@mailb.org>

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