The dark romance of boxing movies gets dusted off and sentimentalized anew in the New York-set drama “Day of the Fight,” actor Jack Huston’s writing and directing debut. Sometimes lumbering though always well-intentioned, it’s an ode to tales of lovable, scrappy galoots who keep a glint in their pummeled eyes. You’d be surprised how far that kind of low-hum redemption energy can still carry a movie, even one as throwback-engineered as this. It stars Michael Pitt, too, another signal of the comeback generosity being seeded here, since the actor, who’s had off-screen troubles, has felt absent from the industry that once anointed him an up-and-comer. That Huston thought of his old “Boardwalk Empire” co-star for the role of down-and-out middleweight legend “Irish” Mike Flannigan instead of playing it himself feels like a gift of sorts and Pitt, his once effortlessly smoldering, fashion-spread pout having settled into a heavy-lidded, bruised pucker, treats the opportunity as such. He embodies the part with mended-wing gratitude. Huston, meanwhile, introduces Pitt’s Mike as if already a last-chance icon, waking up in his dingy but silhouette-friendly apartment — Peter Simonite’s monochrome