Fix lock typo that should be unlock in cel_sqlite_custom reload.

Fix lock typo that should be unlock in cel_sqlite_custom reload.

(closes issue ASTERISK-19356)
Reported by: Alex Villacis Lasso
Patches:
      asterisk-1.8.9.2-cel_sqlite3_custom-fix-reload-locking-typo.patch (license #5617) patch uploaded by Alex Villacis Lasso

Review: https://reviewboard.asterisk.org/r/1740/
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Merged revisions 355319 from http://svn.asterisk.org/svn/asterisk/branches/1.8

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@355320 65c4cc65-6c06-0410-ace0-fbb531ad65f3