Don't print the fact that we are using dead mode in AGI if called from the

'h' extension since it is well-known that it will be running in dead mode.

(closes issue #12046)
Reported by: explidous



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@104020 65c4cc65-6c06-0410-ace0-fbb531ad65f3