fix(targetchange): duplication leaves default actors

Signed-off-by: btry <tbugier@teclib.com>

inc/form.class.php

@@ -1529,7 +1529,7 @@ public function duplicate() {
 
             case PluginFormcreatorTargetChange::class:
                // Drop default actors
-               $target_ticket_actor->deleteByCriteria([
+               $target_change_actor->deleteByCriteria([
                   'plugin_formcreator_targetchanges_id' => $new_target_item_id
                ]);