LOS ANGELES (Reuters) – Oprah Winfrey said she was sorry for the uproar and media response caused by her comments about an incident in a Swiss luxury store last month when an assistant refused to show her a $38,100 handbag. At the premiere of her new film, "Lee Daniels' The Butler," in Los Angles on Monday evening, the U.S. actress and talk show host, recently named by Forbes as the world's most powerful celebrity, said she regretted saying it took place in Switzerland. "I'm really sorry that it got blown up. I purposefully did not mention the name of the store. …