Git commits in Moodle 3.4.8 by Brendan Cox

commit fba7dcd90abd45210d782a79c6e25bb3840c7438
Author: Brendan Cox <brendan.cox@totaralearning.com>
Date:   Thu, 28 Jun 2018 19:58:25 +0800
Tag:    v3.4.8

MDL-62702 core_lib: parameters in POST override other LTI values