* fix: restart service after config change

When chrony was already installed, the service currently does not get
restarted when the config file is changed. I added a "watch" option to
the service.running state to ensure it gets a restart when we adapt the
configuration.

* fix: replace require completely with watch to ensure service restart

Co-authored-by: Imran Iqbal <myii@users.noreply.github.com>

Co-authored-by: Imran Iqbal <myii@users.noreply.github.com>

BREAKING CHANGE: `chrony.removed` replaced by `.clean` states.