By Iris WienerRobby Takac recalls realizing the success of Goo Goo Dolls when their hit “Iris” was chosen as the song to be played when the Detroit Red Wings, the winners of the 1998 Stanley Cup, skated in triumph in front of the enthusiastic, boisterous audience of hockey fans. “I knew that we had crossed into something different from what we knew. And that was a huge moment for me, because then I realized that we were now in a world that I didn’t understand.”A world that he does understand very well is that of the touring musician. On Aug. 12 he hits the Nikon at Jones Beach Theater with lea