Remove include for '../fax/functions.inc.php'

I don't think this line is necessary for versions of FreePBX using bootstrap, and there is a [report](http://pbxinaflash.com/community/index.php?threads/cid-superfecta-not-working-on-new-piaf-green-install.14798/#post-95123) of it interfering with Superfecta operation.