SPRINGFIELD — The Illinois Supreme Court ruled that an insurance policyholder missed the window to sue their insurer for allegedly selling them a deficient policy.The high court found that the policyholder’s cause of action — and the two-year statute of limitations — began when the husband and wife first read their home insurance policy, not when the insurer denied coverage years later.In the 5-2 opinion released Thursday, the justices reversed the 1st District Appellate Court’s decision and …