[erp5_xhtml_style] Search page gadget with the data-gadget-value property

Do not use data-gadget-value, as some gadgets may also have sub gadget declarations

product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/erp5_gadgetfield.js.js

@@ -81,7 +81,7 @@
       return new RSVP.Queue()
         .push(function () {
           var field_element_list =
-            gadget.element.querySelectorAll("[data-gadget-url]"),
+            gadget.element.querySelectorAll("[data-gadget-value]"),
             field_element,
             field_scope,
             field_url,