erp5_run_my_doc: Fix Launch Selenium Test action

@Daetalus and @romain: This commit fixes the Launch Selenium Test action (which raises "Unexpected keyword argument 'select_favorite'"). The removed arguments url, user and password aren't used by the Script and can therefore be removed. Here are the test results of my fork. All tests which didn't pass run into a TimeOut error. The "erp5_run_my_doc:testRunMyDoc" test case passed.