fix: lerp calculations, for vertical slider, in _value function
fix: lerp calculations, for vertical slider, in _value function

zurb/foundation-sites,zurb/foundation-sites,abdullahsalem/foundation-sites,abdullahsalem/foundation-sites,zurb/foundation,zurb/foundation,DaSchTour/foundation-sites,zurb/foundation,zurb/foundation-sites,abdullahsalem/foundation-sites,DaSchTour/foundation-sites