There were plenty of happy faces in the Bills locker room after Sunday’s 22-16 win over the Dolphins was followed by the miraculous finish to the Bengals’ win over the Ravens to put Buffalo in the playoffs for the first time since 1999. The happiest might have belonged to defensive tackle Kyle Williams, who is finally going to the postseason after 12 years with the team. Williams called it “such a good feeling” and said he thought about the former teammates who came and went without getting a taste of the playoffs. Williams, who scored his first touchdown since high school on a one-yard run in the third quarter and had his two sons in the locker room, got to break down the team after all of the excitement.