Christoph Waltz doesn’t miss the burly beard he grew to play an 1800s bounty hunter in Quentin Tarantino’s “Django Unchained.” “I didn’t shave for a year,” said Waltz, who showed up happily cleanshaven after a special screening at AMC Loews 34th Street. Waltz added a behind-the-scenes highlight was working with his childhood hero, Franco Nero — who also starred in the 1966 spaghetti Western “Django.” “When I was 10, he was the biggest star . . . the synonym for the word cool,” Waltz recalled.