With a late budget maneuver, Maryland lawmakers are forcing a hard look at a three-year-old scheme to redevelop Pimlico Race Course, home of the middle jewel of horse racing’s Triple Crown. The Maryland Senate voted to strip out a House of Delegates amendment from the state budget Wednesday that would have withheld $17 million from the Maryland Stadium Authority unless required agreements for the project — which also includes redevelopment of the track at Laurel Park — are signed in the next seven months.