by Chris HeathThirteen years ago they were three scruffy punks from Buffalo bent on drinking themselves into oblivion. Then they turned down their amps and dizzied up the girls.Today, Johnny Rzeznik will kiss about three hundred young women. Six hundred cheeks.Here in Italy, thirteen years after they started out as unkempt Buffalo punks, the Goo Goo Dolls are experiencing their very own small teen-pop inferno, principally as a result of the City of Angels ballad "Iris." At a Milan record signing, where the in-store DJ is playing "Iris" over and over, a mass of panting girls, spilling out into