MDL-69551 quiz: start quiz password field should be a passwordunmask

This help accessibility and usability

mod/quiz/accessrule/password/rule.php

@@ -53,7 +53,7 @@ public function add_preflight_check_form_fields(preflight_check_form $quizform,
 
         // Don't use the 'proper' field name of 'password' since that get's
         // Firefox's password auto-complete over-excited.
-        $mform->addElement('password', 'quizpassword',
+        $mform->addElement('passwordunmask', 'quizpassword',
                 get_string('quizpassword', 'quizaccess_password'), ['autofocus' => 'true']);
     }
 

mod/quiz/tests/behat/attempt_begin.feature

@@ -80,8 +80,6 @@ Feature: The various checks that may happen when an attept is started
     And I should see "Your attempt will have a time limit of 1 hour. When you "
     And I should see "The password entered was incorrect"
     And I set the field "Quiz password" to "Frog"
-    # On Mac/FF tab key is needed as text field in dialogue and page have same id.
-    And I press tab key in "Quiz password" "field"
     And I press "Start attempt"
     And I should see "Text of the first question"
 
@@ -102,8 +100,6 @@ Feature: The various checks that may happen when an attept is started
     And I should see "Your attempt will have a time limit of 1 hour. When you "
     And I should see "The password entered was incorrect"
     And I set the field "Quiz password" to "Frog"
-    # On Mac/FF tab key is needed as text field in dialogue and page have same id.
-    And I press tab key in "Quiz password" "field"
     And I press "Cancel"
     Then I should see "Quiz 1 description"
     And "Attempt quiz" "button" should be visible