Fixes #6632 - show php-fpm PHP mode on new systems only

Author: Till Brehm

install/tpl/system.ini.master

@@ -35,7 +35,7 @@ vhost_aliasdomains=n
 client_username_web_check_disabled=n
 backups_include_into_web_quota=n
 reseller_can_use_options=n
-web_php_options=no,fast-cgi,php-fpm
+web_php_options=no,php-fpm
 show_aps_menu=n
 client_protection=y
 ssh_authentication=