LOS ANGELES — Despite some mighty competition, Katniss and her crew dominated the box office once again."The Hunger Games: Mockingjay — Part 2" held on to its first-place spot in its second weekend in theaters, earning $51.6 million to top "The Good Dinosaur" and "Creed," which both debuted Wednesday, according to Rentrak estimates on Sunday.The fourth and final installment in Lionsgate's highly successful series has grossed $198.3 million to date.Audiences had their pick of genres over the crowded Thanksgiving weekend.