MIDSEASON RETURN: During the first half of the season, ABC’s new incarnation of The Muppets had some viewers complaining about the show’s too-“adult” tone and focus. At midseason, the new executive producer promised to make a course correction of sorts – and tonight, it arrives, in a knowing “meta” plot that has Miss Piggy’s talk and variety show, “Up Late,” getting a mandated makeover. Judge for yourself.