unittest: simplify unittest_compareHelper
unittest: simplify unittest_compareHelper

Since Vc::all_of works for bool arguments too the is_simd SFINAE test is
not needed.

Signed-off-by: Matthias Kretz <372ea4eca737a13cd010ee806d4ce7b98ee71550@kde.org>

mattkretz/virtest,mattkretz/virtest