‘The Fault in Our Stars” made debilitating illness the stuff of soaring teen romance; “Everything, Everything,” adapted from Nicola Yoon’s young adult novel, injects the concept with a lethal dose of saccharine. Amandla Stenberg (“The Hunger Games”) is Maddy, an 18-year-old with severe combined immunodeficiency (SCID), also known as “bubble boy disease.” True to that...