MDL-86366 quiz: Description shouldn't show each secure page, but title.

mod/quiz/attempt.php

@@ -140,7 +140,12 @@ $headtags = $attemptobj->get_html_head_contributions($page);
 $PAGE->set_title($attemptobj->attempt_page_title($page));
 $PAGE->add_body_class('limitedwidth');
 $PAGE->set_heading($attemptobj->get_course()->fullname);
-if ($PAGE->pagelayout !== 'secure') {
+if ($PAGE->pagelayout === 'secure') {
+    // Show the activity header (but only the name) in the secure layout on quiz pages.
+    $PAGE->activityheader->set_attrs([
+        'description' => '',
+    ]);
+} else {
     $PAGE->activityheader->disable();
 }
 if ($attemptobj->is_last_page($page)) {

mod/quiz/tests/behat/attempt_secure_layout.feature

@@ -38,7 +38,9 @@ Feature: Attempt a quiz in secure layout
 
   Scenario: A quiz page on the secure layout shows both the course name and the quiz name
     Given I am on the "Quiz 1" "mod_quiz > View" page logged in as "student"
+    And I should see "Quiz 1"
+    And I should see "Quiz 1 description"
     When I press "Attempt quiz"
     Then I should see "Course 1"
     And I should see "Quiz 1"
-    And I should see "Quiz 1 description"
+    But I should not see "Quiz 1 description"