Pass through PREPARED state after error, when keepalive returns succes.
Pass through PREPARED state after error, when keepalive returns succes.

This is according to the state diagram in client.js.
This will show a spinner at the bottom of a room again
while the catchup sync is in progress,
which seems to have broken at some point.

matrix-org/matrix-js-sdk,krombel/matrix-js-sdk,krombel/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,krombel/matrix-js-sdk,matrix-org/matrix-js-sdk