"I need a change of skin," cries Brian Molko on "Kitty Litter," the lead track of this London trio's sixth album. And along come veteran alt-metal producer David Bottrill and upstart California drummer Steve Forrest to heighten a glam-punk bombast that lost its exoticism when mainstream emo did it bigger, with a better profit margin. Lacking lyrics as memorable as 2006's Meds, Battle for the Sun is heavier but duller, with the gap between Molko's spindly melodies and the fatter, newly