erp5_core: available to invalidate when in Draft state

product/ERP5/bootstrap/erp5_core/WorkflowTemplateItem/portal_workflow/validation_workflow/states/draft.xml

@@ -30,6 +30,8 @@
               <tuple>
                 <string>delete</string>
                 <string>delete_action</string>
+                <string>invalidate</string>
+                <string>invalidate_action</string>
                 <string>validate</string>
                 <string>validate_action</string>
               </tuple>