Two years ago, the Illinois Supreme Court changed a professional-conduct rule to require lawyers to send unidentified funds sitting in their client trust accounts to the Lawyers Trust Fund of Illinois, which helps fund legal services for not-for-profit groups that help low-income individuals around the state.At the time, the trust fund had no idea how much money the rule change would add to its coffers. As of the end of March, the fund surpassed $1 million in unidentified funds it has received that otherwise would have …