Cook County can continue to charge civil litigants a child waiting room fee after a state appeals panel found it isn’t an unconstitutional litigation tax.Plaintiff Randall Gatz sued Cook County Circuit Clerk Dorothy A. Brown and Treasurer Maria Pappas in 2015, alleging the $10 fee — which is assessed to all civil litigants as part of a bundle of other filing costs — violates the state constitution’s free access and due process clauses because it makes every litigant responsible for funding the …