[erp5_core + erp5_ui_test] Use view_mode_listbox in DiffTool

Following convention, it makes more sense to use view mode for DiffTool view.
Also, we don't need selection as of now.

Also, update the tests

bt5/erp5_ui_test/PathTemplateItem/portal_tests/page_templates_zuite/testDiffActionOnModule.zpt

@@ -87,17 +87,17 @@
 </tr>
 <tr>
   <td>assertText</td>
-  <td>//tr[@class='listbox-data-line-2 DataA']/td[2]</td>
+  <td>//tr[@class='listbox-data-line-2 DataA']/td[1]</td>
   <td>title</td>
 </tr>
 <tr>
   <td>assertElementPresent</td>
-  <td>//tr[@class='listbox-data-line-2 DataA']/td[3]/div[@data-gadget-sandbox="public"]</td>
+  <td>//tr[@class='listbox-data-line-2 DataA']/td[2]/div[@data-gadget-sandbox="public"]</td>
   <td></td>
 </tr>
 <tr>
   <td>storeEval</td>
-  <td>document.querySelector('#selenium_myiframe').contentWindow.document.evaluate("//tr[@class='listbox-data-line-2 DataA']/td[3]/div[@data-gadget-sandbox='public']", document.querySelector('#selenium_myiframe').contentWindow.document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue.getAttribute('data-gadget-value');</td>
+  <td>document.querySelector('#selenium_myiframe').contentWindow.document.evaluate("//tr[@class='listbox-data-line-2 DataA']/td[2]/div[@data-gadget-sandbox='public']", document.querySelector('#selenium_myiframe').contentWindow.document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue.getAttribute('data-gadget-value');</td>
   <td>_data_gadget_value</td>
 </tr>
 <tr>

bt5/erp5_ui_test/PathTemplateItem/portal_tests/page_templates_zuite/testDiffActionOnObject.zpt

@@ -78,17 +78,17 @@
 </tr>
 <tr>
   <td>assertText</td>
-  <td>//tr[@class='listbox-data-line-1 DataB']/td[2]</td>
+  <td>//tr[@class='listbox-data-line-1 DataB']/td[1]</td>
   <td>title</td>
 </tr>
 <tr>
   <td>assertElementPresent</td>
-  <td>//tr[@class='listbox-data-line-1 DataB']/td[3]/div[@data-gadget-sandbox="public"]</td>
+  <td>//tr[@class='listbox-data-line-1 DataB']/td[2]/div[@data-gadget-sandbox="public"]</td>
   <td></td>
 </tr>
 <tr>
   <td>storeEval</td>
-  <td>document.querySelector('#selenium_myiframe').contentWindow.document.evaluate("//tr[@class='listbox-data-line-1 DataB']/td[3]/div[@data-gadget-sandbox='public']", document.querySelector('#selenium_myiframe').contentWindow.document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue.getAttribute('data-gadget-value');</td>
+  <td>document.querySelector('#selenium_myiframe').contentWindow.document.evaluate("//tr[@class='listbox-data-line-1 DataB']/td[2]/div[@data-gadget-sandbox='public']", document.querySelector('#selenium_myiframe').contentWindow.document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue.getAttribute('data-gadget-value');</td>
   <td>_data_gadget_value</td>
 </tr>
 <tr>

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_diff/ERP5Site_viewDiffTwoObjectDialog/listbox.xml

@@ -90,7 +90,7 @@
                 </item>
                 <item>
                     <key> <string>field_id</string> </key>
-                    <value> <string>my_list_mode_listbox</string> </value>
+                    <value> <string>my_view_mode_listbox</string> </value>
                 </item>
                 <item>
                     <key> <string>form_id</string> </key>