mod_http_file_share: Fix expiry disabled check for new config API
Similar to 26c30844cac6
-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
module:set_global(); -- we're a global module
-- TODO delete this whole concept