Tough break: Sharp bettors reportedly backed K.C. before Smith’s injury

More than any other factor, injuries to starting quarterbacks move point spreads. No surprise, then, that the Chargers-Chiefs point spread moved about a field goal toward San Diego on Friday after Kansas City quarterback Alex Smith was ruled out with a lacerated spleen. The Chiefs, who were 3.5- to 4-point favorites vs. the Chargers, are…