Fixes FAQ time issue 136

Need to run these queries to update the schema, should perhaps be your call how that is done:


    ALTER TABLE `ost_faq` CHANGE `created` `created` DATETIME NOT NULL 
    ALTER TABLE `ost_faq` CHANGE `updated` `updated` DATETIME NOT NULL 

Original was trying to display the last update of the category, instead of the faq item. Tested, works.

Refer: https://github.com/osTicket/osTicket-1.8/issues/136