refactor: lint and simplify OffCanvas "sticky" methods
refactor: lint and simplify OffCanvas "sticky" methods

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