payment transaction group : fix script to call when doing delivery_action

bt5/erp5_payment_mean/WorkflowTemplateItem/portal_workflow/payment_transaction_group_validation_workflow/transitions/deliver_action.xml

@@ -24,7 +24,7 @@
         </item>
         <item>
             <key> <string>after_script_name</string> </key>
-            <value> <string>deliver</string> </value>
+            <value> <string>begin_delivery</string> </value>
         </item>
         <item>
             <key> <string>description</string> </key>