STAMFORD — Chimpanzee attack victim Charla Nash was interviewed on the “Today” show Wednesday to discuss the recent setback she faced when her body began to reject a face transplant after doctors tried weaning her off anti-rejection drugs. Nash, who was mauled in Stamford in 2009 by her employer’s chimp, was reducing the drugs as part of a military study to determine whether patients who receive transplants can safely taper off the medications, which come with serious side effects, including high blood pressure and diabetes.