Bug 18182: [QA Follow-up] Fix a few typos, consistent rollback
Since we here only use one rollback and this test does not care, it is
more consistent to keep that pattern.
Additionally, promoting two globals to our.
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl> Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io> Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org> Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>