fix psf-users path to use psf-admin group (#625)

Author: JacobCoffee

salt/benchmarks/configs/sshd-hardening.conf

@@ -8,7 +8,7 @@ ChallengeResponseAuthentication no
 PubkeyAuthentication yes
 
 # Restrict who can SSH in - allow PSF users and system admins
-AllowGroups psf-users sudo admin
+AllowGroups psf-admin sudo admin
 
 # Where to read user keys from
 AuthorizedKeysFile .ssh/authorized_keys