fix(upgrade): fix foregin key upgrade of traps_group table

www/install/php/Update-2.8.14_to_2.8.15.php

@@ -37,17 +37,31 @@ if (isset($pearDB)) {
         "SHOW INDEXES FROM `traps_group` WHERE key_name = 'PRIMARY'"
     );
     if ($res->numRows() <= 0) {
+        $pearDB->query(
+            "ALTER TABLE `traps_group_relation` " .
+            "DROP FOREIGN KEY `traps_group_relation_ibfk_2`"
+        );
+
         $pearDB->query(
             "ALTER TABLE `traps_group` " .
             "  CHANGE COLUMN `traps_group_id` " .
             "  `traps_group_id` INT NOT NULL AUTO_INCREMENT"
         );
+
+        $pearDB->query(
+            "ALTER TABLE `traps_group_relation` " .
+            "ADD CONSTRAINT `traps_group_relation_ibfk_2` " .
+            "FOREIGN KEY (`traps_group_id`) REFERENCES `traps_group` (`traps_group_id`) ON DELETE CASCADE"
+        );
+
         $pearDB->query(
             "ALTER TABLE `traps_group` ADD PRIMARY KEY (`traps_group_id`)"
         );
+
         $pearDB->query(
             "ALTER TABLE `traps_group` " .
             "  DROP KEY `traps_group_id`"
         );
+
     }
 }