DENVER — Casey Mittelstadt ended a 19-game scoring drought with a tiebreaking goal in the third period and the Colorado Avalanche beat the NHL-leading Winnipeg Jets 5-2 on Tuesday night. He broke that slump Tuesday by deflecting Josh Manson’s shot by Winnipeg’s Eric Comrie at 7:22, sending Colorado to its fifth straight win. The Avalanche led by a goal in …