DALLAS — Last January, the Mavericks won seven of their last ten games and went 12-4 for the month, catapulting themselves to a strong regular-season finish and, ultimately, the Western Conference finals. Monday night in American Airlines Center, the Mavericks Dallas concluded January play with a tougher-thannecessary 111-105 victory over 13-win Detroit, but that isn’t to say they finished the…