Bugfix for oracle upgrade script.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@10152 b35dd754-fafc-0310-a699-88a17e54d16e

src/database/upgrade/18/openfire_oracle.sql

 -- add isHidden column to mucService
-ALTER TABLE mucService ADD isHidden INTEGER NOT NULL;
+ALTER TABLE mucService ADD isHidden INTEGER;
 
 -- set all current services to isHidden = false
 UPDATE mucService set isHidden = 0;