Don't play "your message has been saved" twice.

(closes issue #12893)
 Reported by: jaroth
 Patches: 
       duplicate_saved.patch uploaded by jaroth (license 50)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@125438 65c4cc65-6c06-0410-ace0-fbb531ad65f3