With the holidays over, the box office is expected to see a significant slowdown until the release of “Captain America: Brave New World” in February. But there is some intrigue this weekend with the release of “Den of Thieves: Pantera,” which is the start of Lionsgate’s campaign to turn around their woeful box office fortunes. From 15 films released last year, Lionsgate grossed a mere $244.7 million at the North American box office, according to data from The Numbers . To put that into