Using default instead of table update for mysql.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@10154 b35dd754-fafc-0310-a699-88a17e54d16e

src/database/upgrade/18/openfire_mysql.sql

-# add isHidden column to mucService
-ALTER TABLE mucService ADD COLUMN isHidden TINYINT NOT NULL;
-
-# set all current services to isHidden = false
-UPDATE mucService set isHidden = 0;
+# add isHidden column to mucService, with isHidden set to false by default
+ALTER TABLE mucService ADD COLUMN isHidden TINYINT NOT NULL DEFAULT 0;
 
 
 UPDATE jiveVersion set version=18 where name = 'openfire';
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