Git commits in Moodle 3.6.5 by Kathrin Osswald

commit ebdc693048a7dbcea5f141d30d0d06c72f1e69c7
Author: Kathrin Osswald <kathrin.osswald@uni-ulm.de>
Date:   Thu, 23 May 2019 21:01:10 +0800
Tag:    v3.6.5

MDL-63240 theme Boost: Removed z-indexes for border styling in navdrawer