NEW YORK — There is a reason why Nets head coach Jacque Vaughn was intent on not overlooking the Washington Wizards. After winning one of the most seesaw contests in NBA history on Wednesday night in Atlanta, Friday’s Eastern Conference matchup at Barclays Center had all the makings of a trap game for Brooklyn, who entered the night as winners of five of their last six. Wes Unseld Jr.’s squad showed up ready to play. Washington kept it competitive for about three and a half quarters until Brooklyn decided to stop messing around. A 90-71 game entering the final frame, the Nets kept their feet o…