State Radio, despite being more mature and lyrically deeper than your average rock/reggae band, maintains a very young following. Their shows tend to be dominated by crowd-surfing frat boys and Uggs-wearing sorority chicks, with Saturday’s show being no exception. And no, this isn’t necessarily a bad thing. The band’s second of two sold-out shows at the 9:30 Club was driven quite successfully by the energy that only such a crowd can provide. The Massachusetts-based trio…