pki: T7249: fix shebang to support CLI backend

Fixes an error:
interpreter/vyatta-cfg-run: line 162: `vyatta_config_commit-confirm': not a valid identifier

Which prevented to renew the certificates. This will only fix renewing of the
certificates. Nothing changed in how daemons will be restarted if a certificate
is updated.

Author: c-po

src/helpers/vyos-certbot-renew-pki.sh

@@ -1,3 +1,3 @@
-#!/bin/sh
+#!/bin/vbash
 source /opt/vyatta/etc/functions/script-template
 /usr/libexec/vyos/conf_mode/pki.py certbot_renew