SPRINGFIELD — Following the U.S. Supreme Court’s decision that federal judges have no role in settling disputes about partisan gerrymandering, Gov. J.B. Pritzker vowed not to support an “unfair” map following the 2020 U.S. Census should Democratic majorities in the legislature control the district-drawing process.The 5-4 decision by the nation’s top court last week means state governments controlled by a single party can draw legislative and congressional boundaries without a threat of legal …