Bug 19843: (bug 15839 follow-up) Set reviews.datereviewed when the review is made

Bug 19843: (bug 15839 follow-up) Set reviews.datereviewed when the review is made

Caused by
  commit 092ae340cef375cc66c8511fd34c1a4eec9c7ba6
    Bug 15839: Koha::Reviews - Remove savereview

the datereviewed=now() part of the query has not been translated.

Test plan:
Add a review from the OPAC
Confirm that the reviews.datereviewd has been correctly set. Without
this patch it is set to NULL.

I have no idea how we could update existing data :-/

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>