Git commits in Moodle 3.4.6 by Paul Holden

commit 4f1725493dbfbcdb938cb36854acb86ccc9c6e8f
Author: Paul Holden <pholden@greenhead.ac.uk>
Date:   Fri, 07 Sep 2018 21:18:45 +0800
Tag:    v3.4.6

MDL-60028 enrol: fix counting of enrolled users in a given context.