When Johnny Rzeznik started to write songs for the next Goo Goo Dolls album, the lead singer couldn’t have known that one of them would become a symbol of hope during one of the nation’s most devastating disasters.Soon after it hit the streets, “Better Days,” the first single from the band’s forthcoming, still-untitled ninth studio album, was used by CNN during the channel’s coverage of Hurricane Katrina and its subsequent relief campaign for the displaced victims along the Gulf Coast“It was like, ’Whatever we can do, let’s do it,’ ” said Rzeznik, who also appeared with the band on MTV’s ReAct