Git commits in Moodle 3.3.1 by Tim Hunt

commit f59741cc6c4cd021b5c15c0746e048fb1de86099
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Wed, 24 May 2017 22:05:32 +0800
Tag:    v3.3.1

MDL-59048 user tours: avoid white-on-white text in Clean