Comment 4 for bug 1751931

Reviewed: https://reviews.mahara.org/8555
Committed: https://git.mahara.org/mahara/mahara/commit/94b4850211a8ed1c388aa67afe1ee9b201c16b2e
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 94b4850211a8ed1c388aa67afe1ee9b201c16b2e
Author: Maria Sorica <email address hidden>
Date: Wed Feb 28 17:30:40 2018 +0000

Bug1751931: For institutions, keep just custom T&C/PS on update

If an institution uses the site T&C and/or privacy statement
as it's own, when the site is upgraded to the 18.04 version,
the institution no longer has any T&C/PS.

If an institution uses its own T&C and/or privacy statement,
when the site is upgraded to the 18.04 version, the custom
items are not deleted but remain the current T&C/PS
for that institution.

Note: If the institution had custom T&C/PS but switched
back to using the site T&C/PS, when the upgrade is done
the custom T&C and/or PS are deleted form the DB.

behatnotneeded

Change-Id: Ib54c39bd8e4cf0b238268387a78f7a056a24a856