Update swiperOptions default to match version 4 of Swiper

Editor assessment

The subject states the alignment precisely: the swiperOptions default now matches version 4 of Swiper, which names both the setting and the target version. fix(slides) and the scope are accurate. No body or footer; at this size the subject is the entire change, and the pull number gives provenance, though a clause on the broken default behavior would have helped. The capitalized 'Update' is a trivial variance. Clear and honest.