The Kansas City Royals’ offense came up short again in crucial points, and it didn’t help that their most dangerous slugger left the game with an injury. The Royals lost 3-0 to the Chicago White Sox in the first game of a doubleheader Tuesday afternoon at Kauffman Stadium. Royals All-Star catcher Salvador Perez left the game with a left thumb strain. Carlos Santana pinch hit for Perez with the bases loaded in the seventh inning and struck out. Royals hitters didn’t have a hit with runners in scoring positions (0 for 12), and they left 12 runners on base. Rookie right-hander Jonathan Heasley ga…