Students from three Wilmington catholic schools spent eight hours on the dance floor last weekend to raise  $243,791 for children in need. Salesianum School, Ursuline Academy and Padua Academy  shattered their $175,000 fundraising goal by nearly $70,000 in this year’s SALSTHON. “At the beginning, I was worried about hitting our number,” said senior Jack Gormley, the student body president at …