LAS VEGAS — Evgenii Dadonov scored his seventh goal of the season and the Vegas Golden Knights beat the Calgary Flames 3-2 on Sunday night. Less than two minutes after Calgary’s Elias Lindholm cut the Golden Knights’ 2-0 lead in half, Dadonov responded by smacking a rebound past Flames goalie Jacob Markstrom to give Vegas a 3-1 lead. And I …