consent: Also serialize _timeout property for the database store.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3045 44740490-163a-0410-bde0-09ae8108e29a

modules/consent/lib/Consent/Store/Database.php

@@ -118,6 +118,7 @@ class sspmod_consent_Consent_Store_Database extends sspmod_consent_Store
             '_username',
             '_password',
             '_table',
+            '_timeout',
         );
     }