OTTAWA, Ontario—Viktor Arvidsson scored twice, and the L.A. Kings took a decisive 5–2 victory over the Ottawa Senators on Tuesday. Matt Roy, Mikey Anderson and Kevin Fiala also had goals, and Anze Kopitar registered three assists for the Kings (14–10–4), who kicked off a six-game road trip. Pheonix Copley made 31 saves in his first…