remove duplicate activity.elementId alter

Author: walkah

src/configs/upgrade/db/mysql/mysql-4.0.0.php

@@ -42,11 +42,6 @@
 SQL;
 mysql_4_0_0($sql);
 
-$sql = <<<SQL
-  ALTER TABLE `{$this->mySqlTablePrefix}activity` ADD `elementId` VARCHAR( 6 ) NOT NULL AFTER `type`;
-SQL;
-$status = $status && mysql_4_0_0($sql);
-
 $sql = <<<SQL
   ALTER TABLE `{$this->mySqlTablePrefix}activity` DROP PRIMARY KEY , ADD PRIMARY KEY ( `owner` , `id` ) ;
 SQL;