Git commits in Moodle 3.5.3 by Paul Holden

commit e273e709bfbc3c5c20cbef975bebf1ef114cd938
Author: Paul Holden <pholden@greenhead.ac.uk>
Date:   Fri, 07 Sep 2018 21:18:45 +0800
Tag:    v3.5.3

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