WASHINGTON — A federal appeals court in Washington declined Monday to order the dismissal of the Michael Flynn prosecution, permitting a judge to scrutinize the Justice Department’s request to dismiss its case against President Donald Trump’s former national security adviser.The en banc decision by the U.S. Court of Appeals for the District of Columbia Circuit keeps the case at least temporarily alive and rebuffs efforts by both Flynn’s lawyers and the Justice Department to force the prosecution to be dropped without …