... by using the new comparison helper macros.
This allows to remove dummy comparison operators from
tst_qstringapisymmetry.
This is also a pre-requisite for a follow-up commit that introduces
relational operators between QLatin1StringView and QByteArrayView.
Task-number: QTBUG-117661
Task-number: QTBUG-108805
Change-Id: I5837b457a777fddff1071bc252982e68d004fa94
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>