Git commits in Moodle 3.4.3 by Marcus Fabriczy

commit 44d7ee093788001891c183b7b0e89b80c41fb80c
Author: Marcus Fabriczy <marcus.fabriczy@blackboard.com>
Date:   Tue, 03 Apr 2018 11:14:16 +0800
Tag:    v3.4.3

MDL-60196 core_course: Fix the display of custom LTI icons