MDL-87149 mod_feedback: Do not use .feedback_is_dependent anymore

Making a visual distinction for dependent questions compared to other
questions does not add much value in the perspective of users. We should
just stop adding the `.feedback_is_dependent` class for dependent
questions.

public/mod/feedback/classes/complete_form.php

@@ -282,9 +282,6 @@ class mod_feedback_complete_form extends moodleform {
      */
     protected function get_suggested_class($item) {
         $class = "feedback_itemlist feedback-item-{$item->typ}";
-        if ($item->dependitem) {
-            $class .= " feedback_is_dependent";
-        }
         if ($item->typ !== 'pagebreak') {
             $itemobj = feedback_get_item_class($item->typ);
             if ($itemobj->get_hasvalue()) {