WASHINGTON — Former President Donald Trump has been out of office for more than three years but he just notched a big win at the Supreme Court.

Friday’s ruling that overturned an important 1984 ruling called Chevron v. Natural Resources Defense Council was a belated victory for Trump’s deregulatory agenda, with all three of his appointees to the high court joining the 6-3 conservative majority.

“The decision was the culmination of a decade-long, billionaire-funded campaign to capture and…