create_vproxy: remove HSTS from subdomains

commit be4324bea removed HSTS from new PHP vhosts, but not vproxys.
Also fix the quote characters on this line.

commit be4324bea2dba0da1fa55e7ccfd2bf557571ebe9
Author: apple <apple@applehq.eu>
Date:   Sun Jun 8 10:06:56 2014 +0100

    create_vhost: do not include subdomains in HSTS