By Simon Bird It will be seven decades next summer since Newcastle last won a domestic trophy. That 1955 triumph, 3-1 over Manchester City, was a life-time ago. Last night Newcastle’s season needed a lifeline. Two Geordies, Sean Longstaff and Dan Burn provided it. It’s early days in the FA Cup but the Magpies need its sparkle to keep their season alive. They remain in the hat, and hope endures. For Eddie Howe, a pressure relieving victory – only a third win in 11 games, eight of them defeats. Relief that they are still playing for more than just a top seven finish in the league. Alan Shearer e…