ABC has cancelled the submarine-treason drama “Last Resort,” but while fans won’t get a second season, they’ve been promised one heck of a finale. “We’re going to give you no-holds barred kick-ass ending,” series co-creator Shawn Ryan tweeted shortly after the news broke. He also confirmed the show will complete its 13-episode run. In a wide-ranging interview with “Kevin Pollak’s Chat Show,” cited by The Hollywood Reporter, Ryan addressed everything from the show’s time slot (“brutal”) to problems with certain demographics (“There was a military aspect to the show that research showed kept some women at a distance”) to what…