Git commits in Moodle 3.9.3 by Hittesh Ahuja

commit 5a9058064633b99f2587dc11273bc992d92a18a2
Author: Hittesh Ahuja <hitteshahuja@gmail.com>
Date:   Fri, 25 Sep 2020 17:50:50 +0800
Tag:    v3.9.3

MDL-65074 mod_quiz: Quiz navigation buttons shouldnt use btn-secondary