rc-status: fix -a to show all services

We need to unset rc_svcname so that all of the services are added to the
list to display.

X-Gentoo-Bug: 409787
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=409787
typo fix

X-Gentoo-Bug: 477006
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=477006
Fixed type in rc-status