Even before the winner of Bands on the Run had been decided, a people's champion had emerged. Flickerstick drank, slept with anything that twitched, and didn't care what you thought of 'em. In a word? They rocked. So when the Texas boys recently came to New York, their lips tight about the show's result but willing to win some new converts, it was tempting to wonder how the band might have changed since becoming TV stars.