SPRINGFIELD — Gov. J.B. Pritzker signed a massive gambling expansion bill a month ago, but the state agency that will oversee the expansion was without a leader until this week.Charles R. Schmadeke, partner in charge at Hinshaw & Culbertson LLP’s Springfield office, became chair of the Illinois Gaming Board on Monday. The board is tasked with permitting licenses for new casinos — including one cleared to be built in Chicago — and overseeing legalized sports betting.Schmadeke, a 1977 graduate of The John Marshall Law …