Sanity — and Santa — have been restored at a Brooklyn public elementary school where St. Nick was banned, the Pledge of Allegiance was dropped and Thanksgiving was replaced with a "harvest festival." The good news arrived at PS 169 in Sunset Park on Monday morning, a day after The Post exposed the bizarre PC extremism of Principal Eujin Jaela Kim. District 15 Superintendent Anita Skop stormed in the front door at 9:50 a.m., and minutes later, two fifth-grade boys were brought to the main office to lead a recital over the public address system of the Pledge of Allegiance,...