Git commits in Moodle 3.8.x by Justin Hunt

commit ec92de91877d7b884f1965de638b416ccf6de6c8
Author: Justin Hunt <poodllsupport@gmail.com>
Date:   Tue, 01 Oct 2019 14:40:04 +0800
Tag:    v3.8.5

MDL-66810 mod_lti: Reinstate deprecated default permissions on iframe