A Bronx principal ordered her teachers to give up their desks last week, and had the furniture dumped at the curb — telling staff she doesn’t want them sitting in class. Donna Connelly, principal of PS 24, the Spuyten Duyvil School in Riverdale, also told teachers to empty their filing cabinets, which she then discarded. With class in session, teachers were told to push their desks and cabinets into the hallway. Custodians then hauled them outside and piled them like trash on the blacktop of a school across the street.