Propellor.Property.Nginx: use System.Posix.Files
Propellor.Property.Nginx: use System.Posix.Files

Bug: the "onChange reloaded" in siteEnabled does not seem to be fired...
Does it works in Propellor.Property.Apache.siteEnabled?

Signed-off-by: Félix Sipma <d5087e5dea1a851b7132333c55dfa34e2097e7dc@gueux.org>

abailly/infra-test,ArchiveTeam/glowing-computing-machine