A Cook Circuit judge dismissed sex-abuse charges against R&B singer R. Kelly on Tuesday based on the recommendation of county State’s Attorney Kim Foxx.The hearing lasted just minutes and came a day after Foxx said she was comfortable dropping the case because Kelly will spend decades in prison for separate convictions in federal court.Kelly was awaiting trial on state charges of sexually abusing four people in the Chicago area, three of whom were minors. He was not present when Judge Lawrence E. Flood dismissed …