slight change for 3.0.5 for updating.

- only return auth options having 2 or more columns (does not change the outcome, the script works fine)
- purge the theme after a successful update the easy way to let style.php do the job

git-svn-id: file:///svn/phpbb/branches/phpBB-3_0_0@9510 89ea8834-ac86-4346-8a33-228a782c2dd0

phpBB/install/database_update.php

@@ -943,7 +943,7 @@ function change_database_data(&$no_updates, $version)
 			$sql = 'SELECT auth_option
 				FROM ' . ACL_OPTIONS_TABLE . '
 				GROUP BY auth_option
-				HAVING COUNT(*) >= 1';
+				HAVING COUNT(*) >= 2';
 			$result = $db->sql_query($sql);
 
 			$auth_options = array();