Fix incorrect toast if security setup skipped
Fix incorrect toast if security setup skipped

DevieListener didn't wait for the user's device list to be downloaded
so it would think the user didn't have cross-signing set up.

Also clear the rest of the state on stop().

Fixes https://github.com/vector-im/riot-web/issues/13372

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