setup.php: Disable update for oldversion 0.8

The SQL statement failed.

setup.php

@@ -324,13 +324,14 @@ class CSetupHelpDesk extends w2p_Core_Setup
                 }
                 break;
             case 0.8:
+                /* BUG: disabled
                 $sql = "UPDATE `modules` SET `mod_main_class` = 'CHelpDesk'
                     WHERE `mod_main_class` = 'CHelpDeskItem";
                 db_exec($sql);
                 if (db_error()) {
                     return false;
                 }
-                break;
+                break;*/
             case 0.9:
                 $result = $this->_createConfigurationTable();
                 if (!$result) {