This should at least temporarily fix a problem where the 't' Dial

option is incorrectly passed to the transferee when built-in
attended transfers are used.  There is still a problem with 'T',
but better to fix some problems than no problems while we work
on it.

(closes issue #7904)
Reported by: k-egg
Patches: 
      transfer-fix-trunk-r97657.diff uploaded by sergee (license 138)
Tested by: sergee, otherwiseguy


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@99026 65c4cc65-6c06-0410-ace0-fbb531ad65f3