2018’s “Super Troopers 2” wasn’t so much fan service as fan self-service. 17 years separated those films; eight years later, along comes “Super Troopers 3,” and any semblance of event status feels duly halved. None of that really amounts to a persuasive reason to exist on the big screen, however: At this point, perhaps simply turning “Super Troopers” into a running sitcom, like a rural GenX “Brooklyn Nine-Nine,” would be a fitting move. That “Super Troopers 3” has resorted to standard wedding-farce shenanigans, somewhat awkwardly grafted onto its usual cop antics, suggests a certain dearth of ideas on the script front. Then again, one wouldn’t have thought repeating “Super Troopers” a particularly good idea — least of all twice — but a whole quarter of a century later, here we are.