Don't peek until the matrix client is ready
When the client loaded, we'd load the room view which would try to
get a room object from the client, fail because the client wasn't
ready, think it's because the user wasn't joined to the room and
start peeking instead.
Coupled with the bug fixed by https://github.com/matrix-org/matrix-js-sdk/pull/1188
this would have caused https://github.com/vector-im/riot-web/issues/11120
