WASHINGTON — The man charged with trying to storm the White House Correspondents’ Association dinner and is accused of trying to kill President Donald Trump took a picture of himself in his hotel room just minutes earlier, outfitted with an ammunition bag, shoulder gun holster and a sheathed knife, investigators said Wednesday in a new court filing. Cole Allen wore black pants, a black shirt and a red tie as he snapped the image in his room at the Washington Hilton, the venue where Trump and hundreds of journalists were meeting for a gala Saturday night, authorities say. Allen, 31, of Torrance, California, was captured when he tried to race past security barricades near the ballroom, prompting an exchange of gunfire with Secret Service agents tasked with safeguarding the event, authorities say. Allen’s federal defender says he’s presumed innocent. Trump, a Republican, was not hurt and was rushed off the stage by his security team. “When you’re impactful, they go after you.…