Fix sip_cfg.notifycid to be set with the defined enum values.

The invalid value used when notifycid was enabled was benign.  As far as
the code was concerned -1 and 1 are equivalent.

(closes issue ASTERISK-19232)
Reported by: Eike Kuiper
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Merged revisions 352090 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 352091 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@352092 65c4cc65-6c06-0410-ace0-fbb531ad65f3