Git commits in Moodle 3.2.4 by Tim Hunt

commit 67970b86758fa9319b3354f667481c083d792182
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Wed, 24 May 2017 22:05:32 +0800
Tag:    v3.2.4

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