Cook County, Illinois, asked the Supreme Court Thursday to drop a Second Amendment case involving the area’s semiautomatic gun ban after one plaintiff announced he was withdrawing. Cutberto Viramontes filed paperwork seeking to be dropped from Viramontes v. Cook County, which the justices agreed to hear on June 30. In a motion filed Thursday, attorneys for Cook County, which includes Chicago, asked the Supreme Court to drop the case, claiming th…