Fix monitoring calls put in a parking lot.

* Fix a regression that was introduced by -r366167 which effectively
disabled monitoring parked calls.

(closes issue ASTERISK-20012)
Reported by: sdolloff
Tested by: rmudgett
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Merged revisions 369043 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 369044 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@369057 65c4cc65-6c06-0410-ace0-fbb531ad65f3