app_queue: Re-add HoldTime to QueueCallerAbandon event (simple typo during ast12 refactor).

Reported by: Ibrahim22 (on IRC)
Tested by: Ibrahim22
........

Merged revisions 411811 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@411812 65c4cc65-6c06-0410-ace0-fbb531ad65f3