Properly pack the parameters into ast_json_pack when sending a send fax message

This patch properly packs the parameters into the send fax message so that it
actually work.

Missing a ',' between two string fields can be difficult to debug, particularly
when the actual packing succeeds. Interestingly enough, this didn't actually
crash until the JSON blob we deref'd and disposed of. Since that happened in
a different thread, it was pretty tough to track down.



git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@392676 f38db490-d61c-443f-a65b-d21fe96a405b