Properly hangup the original dialed channel, not the new channel that appeared...

Properly hangup the original dialed channel, not the new channel that appeared from the forwarding. (issue #9161 reported by PhilSmith)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@57011 65c4cc65-6c06-0410-ace0-fbb531ad65f3