For anyone who may have wondered if President Trump would give up the spotlight and let the first lady field all the questions from reporters at the premiere of her film "Melania" Thursday night, the answer was no.  When he stepped into the building that is now called the Trump Kennedy Center, Mr. Trump backed a few feet away from his wife so photographers could take some solo photos of her.  After that, he dominated their joint appearance on the 90-foot red carpet — which was covered with a