Friday the 13th during prom season is the perfect day to acknowledge the blood-spattered prom queen was plus-sized on the page. — Carrie White was fat. Surprised? I know, right, because a chunky girl is not what springs to mind in conjunction with prom’s most infamous moment: A waifish Carrie stands on stage in a pink slip, glittering tiara atop her long locks as she marvels at being crowned prom queen, only…