r/ssh-host-certs: Fix circular dep in reload.path

The `reload-ssh-cert.path` unit introduced a circular ordering
dependency with `sshd.service` by way of `paths.target`.  There's no
particular reason for this dependency here, so we need to remove it to
resolve the issue.

roles/ssh-host-certs/files/reload-ssh-cert.path

@@ -1,6 +1,5 @@
 [Unit]
 Description=Watch SSH Host certificates for renewal
-After=sshd.service
 
 [Path]
 PathChanged=/etc/ssh/ssh_host_rsa_key-cert.pub