ANNAPOLIS, Md. — Prosecutors dropped charges against Adnan Syed on Tuesday in the 1999 killing of Hae Min after additional DNA testing excluded him as a suspect in a case chronicled by the hit podcast “Serial.”Marilyn Mosby, the state’s attorney for the city of Baltimore, said her office would continue to pursue justice for Lee but that it had closed its case against Syed, who spent 23 years in prison for the killing. She said the decision was made after additional DNA testing excluded Syed as a …