Fix up some PBX logic that became broken. The code would exit prematurely when...

Fix up some PBX logic that became broken. The code would exit prematurely when it should have been collecting more digits.
(closes issue #11175)
Reported by: pj


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89072 65c4cc65-6c06-0410-ace0-fbb531ad65f3