CI: Fix classes feature

Author: ywarnier

tests/behat/features/class.feature

@@ -6,8 +6,7 @@ Feature: Classes
   Scenario: Create a class
       Given I am a platform administrator
       And I am on "/main/admin/usergroups.php?action=add"
-      When I fill in the following:
-          | name          | Class 1               |
-          | description   | class description  |
+      When I fill "usergroup_name" with "Class 1"
+      And I fill "description" with "class description"
       And I press "submit"
       Then I should see "Item added"