erp5_officejs_ui_test: minor fix in discussion tool tests

bt5/erp5_officejs_ui_test/PathTemplateItem/portal_tests/officejs_ui_discussiontool_zuite/testOfficeJSDiscussionTool.zpt

@@ -118,7 +118,7 @@
   <td></td>
 </tr>
 <tr>
- <td>assertElementPresent</td>
+ <td>waitForElementPresent</td>
  <td>//div[contains(@data-gadget-url, 'gadget_erp5_header.html')]//a[@data-i18n="Actions"]</td>
  <td></td>
 </tr>

bt5/erp5_officejs_ui_test/PathTemplateItem/portal_tests/officejs_ui_discussiontool_zuite/testOfficeJSDiscussionToolActionReply.zpt

@@ -102,7 +102,7 @@
 </tal:block>
 
 <tr>
- <td>assertElementPresent</td>
+ <td>waitForElementPresent</td>
  <td>//div[contains(@data-gadget-url, 'gadget_erp5_header.html')]//a[@data-i18n="Actions"]</td>
  <td></td>
 </tr>