Anson Boon got so into playing Johnny Rotten that he hurt himself rocking too hard. “If you look at frontmen, they hold the microphone and they stand still. It’s beautiful. It’s great. But Johnny Rotten never stood still. He never retreated from the audience,” the British actor, who plays the Sex Pistols’ foul-mouthed, foul-teethed lead singer in FX’s miniseries “Pistol,” told the Daily News. “This band, in a way, they were part of the audience. They were part of the people. They weren’t these removed superstars. That was fresh. They shook things up, and they had a unique approach to what they…