HM3: Brief change

The "LegwearMaleBriefs" set will be going away soon, as I've incorporated all nine items it contains into the "LegwearMaleSpandex" set, which I just updated. I also took Kaldath's suggestion and turned the most recent set of Spandex into super-hero Underoo-style briefs as well, to supplement the existing longer-legged shorts already present.