ST. LOUIS — Cardinals left-hander Steven Matz tossed a second consecutive scoreless outing of at least six innings to stop the recent slide and send the team into the off day on a winning note. The Cardinals snapped a three-game losing slide with a 3-0 win over the Chicago Cubs in the finale of a four-game series in front of an announced crowd of 43,670 at Busch Stadium on Sunday afternoon. That…