WASHINGTON — The rancorous debate over whether returning students should wear masks in the classroom has moved from school boards to courtrooms.In at least 14 states, lawsuits have been filed either for or against masks in schools. In some cases, normally rule-enforcing school administrators are finding themselves fighting state leaders in the name of keeping kids safe.Legal experts say that while state laws normally trump local control, legal arguments from mask proponents have a good chance of coming out on top …