MINNEAPOLIS — From half-court practice shots that got Oklahoma City fans uptight to Luka Doncic heading basketballs at the rim to Dwight Powell’s, um, interesting baseline pantomime routine before home games, the Mavericks enjoy each other’s company. Not just on the floor, either. They go bowling and to the movies and chill at each other’s cribs. Basically, it’s the world’s tallest fraternity. …