A Chicago police officer who maintains he approached a man on the street because he thought he had sold a loose cigarette must face a lawsuit accusing him of violating the man’s constitutional rights.In a written opinion last week, U.S. District Judge Matthew F. Kennelly declined to throw out the claims of unreasonable seizure and excessive force that Eugene Tucker brought against officer Agustin Torres.Kennelly noted Tucker and Torres gave “significantly different versions” of their August 2014 encounter …