remove ALREADYGONE flag on ooh323 call data by ooh323_indicate

(CONGESTION/BUSY) due to call hasn't gone there really.
This indication arrive from asterisk core not h.323 stack

(closes issue ASTERISK-19308)
Reported by: Dmitry Melekhov
Patches:
        ASTERISK-19308.patch
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Merged revisions 371089 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 371090 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@371091 65c4cc65-6c06-0410-ace0-fbb531ad65f3