"Always insert X-Spam-* headers" cannot be enabled

==== Required information ====
- iRedMail version: 0.9.0
- iRedAdminPro version: 1.9.1
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MYSQL
- Linux/BSD distribution name and version: Debian 7
====

Hi,

I've updated today to latest version of iRedMail and iRedAdminPro and i've seen that "Always insert X-Spam-* headers" checkbox back unchecked after press save button. I've not checked this before, then i don't know if is a new problem.

¡¡Greetings!!