net-mgmt/icingaweb2-module-director: Fix icinga-director daemon

The last update lost important information from the pkg-plist. Restore
it to make it possible to start icinga-daemon again. Without this
change the daemon could not start because of wrong permissions in
/var/run.

Starting icinga_director.
daemon: ppidfile ``/var/run/icinga-director/icinga_director.pid'': Permission denied
/usr/local/etc/rc.d/icinga-director: WARNING: failed to start icinga_director

PR: 277212
Approved by: portmgr (blanket, just fix it)
Fixes: 02bf6f32a982