Bug 11996: (follow-up) Updating the uk-UA currency

Bug 11996: (follow-up) Updating the uk-UA currency

I have changed GRN to UAH in both
installer/data/mysql/ru-RU/optional/sample_currency.sql and in
installer/data/mysql/uk-UA/optional/sample_currency.sql

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 732e69f4b25b7af22ab034f143b8df5d7ffd263a)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>