Donald Trump’s once-trusted fixer and attorney ratted on him in court on Monday — and somehow there wasn’t a blowup. Michael Cohen’s taking to the stand in the criminal hush money trial was the kind of showdown in which the former might not be able to keep his cool. The two men have openly expressed contempt for each other for years. But Stephanie Grisham, Trump’s former White House Communications Director, said during an appearance on CNN’s “Out Front” that her former boss who has had trouble staying awake or keeping from cursing in court managed to keep calm for the sake of his image. “I thi…