erp5_trade: order_workflow added possibility to use cancel in auto_planned state

bt5/erp5_trade/WorkflowTemplateItem/portal_workflow/order_workflow/states/auto_planned.xml

@@ -28,6 +28,8 @@
             <key> <string>transitions</string> </key>
             <value>
               <tuple>
+                <string>cancel</string>
+                <string>cancel_action</string>
                 <string>order</string>
                 <string>order_action</string>
                 <string>plan</string>