MFH: r518248
x11/pcdm: Fix rc script for FreeBSD
PCDM doesn't daemonize/fork, so we need to handle this by using
daemon(8). It seems this port has only been used/tested on TrueOS with
OpenRC, so it has been broken in FreeBSD ports for the last two years.
PR: 227034
Reported by: VulcanRider
Approved by: just fix it
Sponsored by: vBSDcon 2019
Approved by: ports-secteam (blanket, runtime fix)