res_config_pgsql: Fix ast_update2_realtime calls.

Fix so multiple updates from a single call works (add missing ',').
Remove bogus ast_free's that weren't supposed to be there.
Moved a few spaces for readability.

Review: https://reviewboard.asterisk.org/r/3194/
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Merged revisions 407873 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@407874 f38db490-d61c-443f-a65b-d21fe96a405b