Merging #26 resulted in duplicate /var/lib/monit declarations, remove old declaration

Looks like an oversight on my part - someone else fixed the bug I was chasing a different way and declared /var/lib/monit right in init.pp. Merging #26 resulted in both the id_dir form and the first one, which led to failed compilation on redhat systems.

This removes the redhat-specific declaration and adds the service dependency on the id_dir one.