erp5_trade: only manager can cancel packing list

bt5/erp5_trade/WorkflowTemplateItem/portal_workflow/packing_list_workflow/transitions/cancel_action.xml

@@ -10,6 +10,10 @@
             <key> <string>actbox_category</string> </key>
             <value> <string>workflow</string> </value>
         </item>
+        <item>
+            <key> <string>actbox_icon</string> </key>
+            <value> <string></string> </value>
+        </item>
         <item>
             <key> <string>actbox_name</string> </key>
             <value> <string>Cancel Packing List</string> </value>
@@ -65,7 +69,6 @@
             <key> <string>roles</string> </key>
             <value>
               <tuple>
-                <string>Assignor</string>
                 <string>Manager</string>
               </tuple>
             </value>