By Denny Dyroff, Staff Writer, The Times The Mavericks Only a handful of American rock bands that have been able to rise to the top and then remain there indefinitely. The Mavericks, who will be performing on June10 at the Sugarhouse Casino (1001 North Delaware Avenue, Philadelphia, 877-477-3715, www.sugarhousecasino.com),www.thefillmorephilly.com), are one of those bands.    Send...