knowledge_pad_ui_test: fix a flaky test

Pause to make sure the server has time to process the request.
This is of course not a good fix, but the future of this code is really
uncertain, so this should at least fix the failing test.

bt5/erp5_knowledge_pad_ui_test/PathTemplateItem/portal_tests/gadgets_zuite/testBasicGadgetSystem.zpt

@@ -175,6 +175,11 @@
   <td>//button[@id="rename_tab_dialog_rename_button"]</td>
   <td></td>
 </tr>
+<tr>
+  <td>pause</td>
+  <td>1000</td>
+  <td></td>
+</tr>
 <span metal:use-macro="container/Zuite_CommonTemplate/macros/wait_for_activities"> Wait for activities</span>
 
 <!-- Test removing pad -->
@@ -193,6 +198,11 @@
   <td>Are you sure you want to remove this pad from your home?</td>
   <td></td>
 </tr>
+<tr>
+  <td>pause</td>
+  <td>1000</td>
+  <td></td>
+</tr>
 <span metal:use-macro="container/Zuite_CommonTemplate/macros/wait_for_activities"> Wait for activities</span>
 <tr>
   <td>openAndWait</td>