Reverts the earlier triggerRestart change. Forwarding the numeric tag forces
release_and_deploy to look up `dokku/<app>:N` (the bare local name), which
was never tagged when image-repo overrides the default. `fn-verify-app-image`
then retag-after-pulls and the underlying image ID ends up with two tags,
which prevents scheduler-docker-local's image retire path from removing the
old numeric tag (it uses unforced `docker image remove`).
64a5b1517a