The tests for toString/fromString previously didn't run tests
for timezones with hh:mm where mm != 00.
Change-Id: I74da99c5b6890f46ce06446084a8129b4cbc7a02
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: John Layt <jlayt@kde.org>