LOS ANGELES — “The Fate of the Furious” sped into first place at the box office again, leaving new thriller “Unforgettable” and historical drama “The Promise” in the dust. Universal Pictures’ eighth installment in “The Fast and the Furious” franchise earned $38.7 million over the weekend, down 61 percent from its debut, according to studio estimates Sunday. The new competition didn’t stand a chance against the high-octane film, which had the biggest worldwide opening of all time last weekend.