CHICAGO —There is no secret to Lonzo Ball’s improved 3-point shooting. He put the work in, and it’s paying off. He has come a long way from long distance. “It’s night and day now,” he said. Ball made seven of Chicago’s 15 3-pointers and Zach LaVine scored 23 points, powering the Bulls to a 117–107 victory over the Dallas Mavericks on Wednesday night. Ball went 7 for 10 from deep and finished with 21 points. He is shooting 44.7 percent from beyond the arc in his first year with the Bulls, continuing his steady rise from shooting 30.5 percent from 3 during his rookie season in 2017–18 with the Lakers. “He deserves a lot of credit,” Bulls coach Billy Donovan said. “He’s put in an incredible amount of work to get himself to that level.” Five players scored in double figures for Chicago during its second consecutive victory. Nikola Vucevic …