Always show the spinner during the first sync
Always show the spinner during the first sync

Before, we were relying on the fact that `ready` would still have
been false from before. This was not the case, for example, if we
naviagted straight to /#/login (which causes a guest session to be
set up and the sync for that completes after we navigate to the
login screen).

We should always mark ourselves as not-ready after login since we
will always have to wait for the sync.

aperezdc/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,aperezdc/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,aperezdc/matrix-react-sdk,aperezdc/matrix-react-sdk,matrix-org/matrix-react-sdk