Two Illinois writers failed to show that the makers of the TBS series “The Guest Book” ripped off their idea for a sitcom set in a bed-and-breakfast, a federal judge ruled.In a written opinion Tuesday, U.S. District Judge Harry D. Leinenweber dismissed the copyright-infringement lawsuit Diana Meynart Hanzel and Michael David Slowik filed against Turner Broadcasting System Inc. and other defendants.Leinenweber noted the parties do not dispute that Meynart-Hanzel and Slowik hold valid copyrights to documents and …