SPRINGFIELD — While extending a popular tax credit for businesses, lawmakers extinguished a chance to give taxpayers additional leverage in court.An Illinois Supreme Court case challenging how a state agency distributed incentives was mooted last week by a law that extends the program until 2022 and encourages businesses to expand in poorer parts of the state.House Bill 162, approved by large, bipartisan majorities in the House and Senate and signed into law by Republican Gov. Bruce Rauner in September, also …