Git commits in Moodle 3.8.x by Hittesh Ahuja

commit e01066d67cb9a17948127a5556f65aacb9a6a5d2
Author: Hittesh Ahuja <hitteshahuja@gmail.com>
Date:   Fri, 25 Sep 2020 17:50:50 +0800
Tag:    v3.8.6

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