MDL-38337 quiz: respect maximum grade config for new quizzes.

mod/quiz/mod_form.php

@@ -388,6 +388,10 @@ protected function definition() {
         // Check and act on whether setting outcomes is considered an advanced setting.
         $mform->setAdvanced('modoutcomes', !empty($quizconfig->outcomes_adv));
 
+        // The standard_coursemodule_elements method sets this to 100, but the
+        // quiz has its own setting, so use that.
+        $mform->setDefault('grade', $quizconfig->maximumgrade);
+
         // -------------------------------------------------------------------------------
         $this->add_action_buttons();
     }