PARK CITY, Utah — Mitt Romney did not ride a donkey. But the one-time presidential nominee and now candidate for Senate did cheer enthusiastically at a donkey basketball game, campaigning on the ground in Utah like a homegrown hero — even though he grew up somewhere else. What he isn’t doing much is talking about President Trump. Romney was once a leading figure in the “Never Trump” movement, but now he says he wants to work with the president.