erp5_run_my_doc: Add **kw and remove unused arguments

Adding **kw prevents "Unexpected keyword argument 'select_favorite'".
The removed arguments url, user and password aren't used by the Script and can therefore be removed.

bt5/erp5_run_my_doc/SkinTemplateItem/portal_skins/erp5_run_my_doc/TestPage_runSeleniumTest.xml

@@ -50,7 +50,7 @@
         </item>
         <item>
             <key> <string>_params</string> </key>
-            <value> <string>zuite_id=\'tutorial_zuite\', url=None, user="", password=""</string> </value>
+            <value> <string>zuite_id=\'tutorial_zuite\', **kw</string> </value>
         </item>
         <item>
             <key> <string>id</string> </key>