erp5_credential: accept other parameter

bt5/erp5_credential/SkinTemplateItem/portal_skins/erp5_credential/NotificationMessage_getSubstitutionMappingDictFromArgument.xml

@@ -50,7 +50,7 @@
         </item>
         <item>
             <key> <string>_params</string> </key>
-            <value> <string>mapping_dict=None</string> </value>
+            <value> <string>mapping_dict=None,**kw</string> </value>
         </item>
         <item>
             <key> <string>id</string> </key>