Git commits in Moodle 3.6.4 by Tom Dickman

commit a9883c6ee7c455af40e5bdaaa0479531ae0c4802
Author: Tom Dickman <tomdickman@catalyst-au.net>
Date:   Mon, 18 Mar 2019 09:05:18 +0800
Tag:    v3.6.4

MDL-64194 block_myoverview: fix incorrect pagination