Lawyers for a Somerville teenager charged with using a broomstick to rape another student at a Berkshire County sports camp want their client tried in juvenile court. Lawyers for Galileo Mondol, 17, asked a judge Tuesday to dismiss his indictments because of a change in state law that prohibits adult charges against those under age 18 in most cases. The Berkshire Eagle reported that prosecutors asked that proceedings remain in adult court. The judge did not immediately rule. Prosecutors say Mondol was one of three Somerville High School soccer players charged with sexually assaulting teammates Aug. 25 at a preseason team-building camp in Otis.