res_pjsip_config_wizard: Change FILEUNCHANGED config_load2 flag determination

The module now applies the FILEUNCHANGED flag when both reloaded is
specified AND there's no last_config for the object type.

Tested-by: George Joseph

Review: https://reviewboard.asterisk.org/r/4276/
........

Merged revisions 429699 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@429700 f38db490-d61c-443f-a65b-d21fe96a405b