core: Make Base_viewFieldLibrary/my_view_mode_listbox support configuration

The dynamic selection name calculation must also take into account the
case when listbox is displayed in list mode through Base_viewListMode

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Base_viewFieldLibrary/my_view_mode_listbox.xml

@@ -583,7 +583,7 @@ string:Base_viewListMode?proxy_form_id=${form/getId}&proxy_field_id=${field/getI
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>python: \'%s_%s_selection\' % (form.getId(), field.getId())</string> </value>
+            <value> <string>python: \'%s_%s_selection\' % (request.get(\'proxy_form_id\', form.getId()), request.get(\'proxy_field_id\', field.getId()))</string> </value>
         </item>
       </dictionary>
     </pickle>