erp5_officejs_support_request_ui: Fix code to select the first element if only one

( Also, remove the usage of document.getElementById because we should search only inside the current gadget )
( Jérome: the getElementById thing was lost in rebase. It is not critical in my understanding )

bt5/erp5_officejs_support_request_ui/PathTemplateItem/web_page_module/gadget_supportrequest_fast_view_dialog_js.js

@@ -66,6 +66,9 @@
         for (j = 0; j < sp_list.length; j += 1) {
           sp_select.options[j] = new Option(sp_list[j][0], sp_list[j][1]);
         }
+        if (sp_select.options.length === 2) {
+          sp_select.selectedIndex = 1;
+        }
       });
     })
     .onEvent('change', function (evt) {

bt5/erp5_officejs_support_request_ui/PathTemplateItem/web_page_module/gadget_supportrequest_fast_view_dialog_js.xml

@@ -260,7 +260,7 @@
                           </tuple>
                           <state>
                             <tuple>
-                              <float>1607511772.31</float>
+                              <float>1607511772.32</float>
                               <string>GMT+1</string>
                             </tuple>
                           </state>