update to use the no-fork mode provided by service class

resources/service/debian.service

@@ -24,7 +24,7 @@ WorkingDirectory=/var/www/fusionpbx
 ;EnvironmentFile=-/etc/default/fusionpbx
 ExecStartPre=/bin/mkdir -p /var/run/fusionpbx
 ;ExecStartPre=/bin/chown -R ${USER}:${GROUP} /var/www/fusionpbx
-ExecStart=/usr/bin/php /var/www/fusionpbx/app/maintenance/resources/service/maintenance_service
+ExecStart=/usr/bin/php /var/www/fusionpbx/app/maintenance/resources/service/maintenance_service --no-fork
 TimeoutSec=55s
 Restart=always