Start running poll whenever isSyncing changes
Start running poll whenever isSyncing changes

This ensures that timing is not important, ie. if user data is refreshed
later, we can still start running poll() if user is syncing.

fotinakis/travis-web,fotinakis/travis-web,2947721120/travis-web,fauxton/travis-web,travis-ci/travis-web,travis-ci/travis-web,fauxton/travis-web,Tiger66639/travis-web,jlrigau/travis-web,jlrigau/travis-web,fauxton/travis-web,jlrigau/travis-web,2947721120/travis-web,jlrigau/travis-web,Tiger66639/travis-web,mjlambert/travis-web,mjlambert/travis-web,fauxton/travis-web,mjlambert/travis-web,Tiger66639/travis-web,2947721120/travis-web,mjlambert/travis-web,fotinakis/travis-web,2947721120/travis-web,fotinakis/travis-web,travis-ci/travis-web,Tiger66639/travis-web,travis-ci/travis-web