[erp5_web_renderjs_ui] Multicheckbox: do not manually create the gadget DOM element

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_multicheckboxfield_js.js

@@ -25,7 +25,7 @@
 
     return gadget.declareGadget('gadget_html5_input.html', {
       scope: item[1],
-      element: document.createElement('span')
+      element: 'span'
     })
       .push(function (result) {
         input_gadget = result;

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_multicheckboxfield_js.xml

@@ -230,7 +230,7 @@
             </item>
             <item>
                 <key> <string>serial</string> </key>
-                <value> <string>965.13193.22070.47923</string> </value>
+                <value> <string>971.50596.31143.27050</string> </value>
             </item>
             <item>
                 <key> <string>state</string> </key>
@@ -248,7 +248,7 @@
                     </tuple>
                     <state>
                       <tuple>
-                        <float>1536328261.87</float>
+                        <float>1542818919.2</float>
                         <string>UTC</string>
                       </tuple>
                     </state>