Use the default that the log output claims will be used for the basedn

(closes issue #12599)
Reported by: suretec
Patches:
      12599.patch uploaded by juggie (license 24)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@115521 65c4cc65-6c06-0410-ace0-fbb531ad65f3