Clean up the calls to group_add_service
Clean up the calls to group_add_service

This function should only be called once and it does not take any
arguments.

X-Gentoo-Bug: 639166
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=639166

dwfreed/openrc,williamh/openrc,OpenRC/openrc,dwfreed/openrc,williamh/openrc,OpenRC/openrc,OpenRC/openrc,dwfreed/openrc,williamh/openrc