AT first the British actor Hugh Dancy seemed to Be Entirely wrong to play the title character in Adam, Said Max Mayer, the film writer and director. That WAS the trouble Mr. Dancy, 34, seemed too charming, too intuitive, too easy in Himself just right for a movie like Ella Enchanted (Played Prince Charmont h) but not so perfect for a Character Who Was not so perfect. But Mr. Dancy managed to convince Mr. Mayer in a long and intense meeting That He Was right for Adam, a socially inept, Emotionally shuttered young man with Aspergers syndrome, a form of autism. "