SPRINGFIELD — Gov. J.B. Pritzker’s annual budget address on Wednesday sang the virtues of one state constitutional amendment and dismissed the wisdom of a commonly suggested overhaul.The first-term governor used the speech on the Illinois House floor to pitch the graduated income tax — on the ballot this November as a proposed amendment to the Illinois Constitution — tying the mainstay of his policy agenda to a $1.4 billion “reserve” that could be collected and spent if voters approve …