Fix qqmllocale test

Test was only passing the time to the format function, thinking it was
the only part under test, but the date is also relevant due to DST being
part of the formatted output.

Task-number: QTBUG-34406
Change-Id: I1f542b58907281632ee3c96b9b5b38426936953e
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>