Bug 18222 - Fix tests broken by Buug 18026

Bug 18222 - Fix tests broken by Buug 18026

root@koha_ci_1:/home/koha/Koha# KOHA_CONF=$KOHA_CONF perl t/Koha_Template_Plugin_Koha.t
1..3
ok 1 - use Koha::Template::Plugin::Koha;
ok 2
    1..2
    ok 1 - Correct development version
    ok 2 - Correct maintenance version
ok 3 - Koha::Template::Plugin::Koha::Version tests

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>