ERP5TypeFunctionalTestCase: Rely on field ids rather than names.

Allows to keep UI tests working independently of the login process
implementation details.

product/ERP5Type/tests/ERP5TypeFunctionalTestCase.py

@@ -227,11 +227,11 @@ class FunctionalTestRunner:
 
       browser.get(self._getTestBaseURL() + '/login_form')
       login_field = WebDriverWait(browser, 10).until(
-        EC.presence_of_element_located((By.NAME, '__ac_name')),
+        EC.presence_of_element_located((By.ID, 'name')),
       )
       login_field.clear()
       login_field.send_keys(self.user)
-      password_field = browser.find_element_by_name('__ac_password')
+      password_field = browser.find_element_by_id('password')
       password_field.clear()
       password_field.send_keys(self.password)
       login_form_url = browser.current_url