By KELIN DILLON Italian restaurateur Rolly Pavia revealed his new restaurant, Osteria del Becco, to Mexico City in a soft opening held on Thursday, Dec. 10.  The Colonia Polanco based eatery resides on Goldsmith in the former location of Grupo Becco’s first establishment, L’Osteria del Becco, that was conceived in 2002. The building has been completely renovated to provide a