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/


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/1.8@407873 f38db490-d61c-443f-a65b-d21fe96a405b