Cleanup references to in_translate[x].format and
out_translate[x].format in ast_audiohook_detach_list.

ASTERISK-24465 #close
Reported by: Corey Farrell
Review: https://reviewboard.asterisk.org/r/4124/
........

Merged revisions 426803 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@426804 65c4cc65-6c06-0410-ace0-fbb531ad65f3