CALGARY, Alberta — Three days after playing their most complete game of the season, the Blues left room for improvement during a 4-3 loss to the Flames on Tuesday night. Brandon Saad scored the game-winning goal for St. Louis with 48 seconds left in the third period, off the post and in, his second of the evening to give the Blues an unlikely two points on Tuesday. Saad’s goal ended an odd one in Calgary in which the Blues relied on Jordan Binnington too much at times, turnovers dogged St. Louis again, and the Blues fought back from a two-goal deficit for just the third time this season. On Tu…