Git commits in Moodle 3.9.x by Thomas.Ludwig

commit 9bdd83c9fd0caef0e8f35b957a1cbb6f21c70630
Author: Thomas.Ludwig <thomas.ludwig@isb.bayern.de>
Date:   Tue, 10 Mar 2020 22:01:29 +0800
Tag:    v3.9.0-beta

MDL-67903 core_grades: remove outdated CSS for grade import form