Git commits in Moodle 3.3.6 by Kathrin Osswald

commit 470a789ac29d79e94b7d0cc8325f3c492c0191b1
Author: Kathrin Osswald <kathrin.osswald@uni-ulm.de>
Date:   Wed, 25 Apr 2018 16:59:53 +0800
Tag:    v3.3.6

MDL-61411 theme Boost: Close navigation on all items (on small screens)