An appeals court affirmed a schoolteacher’s firing for using sick days when she wasn’t sick.A divided 1st District Appellate Court panel deemed the dismissal of a Chicago elementary school teacher for taking trips to New York, the Caribbean and Norway after calling in sick was warranted under the state’s School Code.The law says teachers should first get a written warning when they engage in “irremediable” conduct. But it also states in Section 34-85 that such warnings are obviated for …