AUSTIN, Texas (AP) — Texas turned up a lock-down defense to get the Longhorns their first Big 12 win of the season. Matt Coleman III scored 14 points and the Longhorns held Kansas State scoreless for the first eight minutes of the second half to pull away for a 64-50 victory Saturday night. Texas led 31-27 at halftime, then shut down everything the Wildcats tried to do. The Longhorns forced…