MDL-70148 behat: Use key_press for autocomplete escape

In Moodle 3.5 dialogues are focused too frequently and active focus is
often wrong. This means that the dialogue has focus after selecting an
element in a form autocomplete element. As a result, pressing the escape
key causes the dialogue to be closed.

The older `key_press` call is sufficient to close the autocomplete in
the cases where this is needed, but will not cuase the dialogue to be
closed.

lib/behat/form_field/behat_form_autocomplete.php

@@ -82,8 +82,9 @@ class behat_form_autocomplete extends behat_form_text {
             }
             $this->wait_for_pending_js();
 
-            // Press the escape to close the autocomplete suggestions list.
-            behat_base::type_keys($this->session, [behat_keys::ESCAPE]);
+            // Note: This does not make use of the `type_keys` API because it can cause some modals to close.
+            // This is not an issue in later versions of Moodle where the autocomplete handling has been updated.
+            $this->key_press(27);
             $this->wait_for_pending_js();
         }
     }