(Reuters)  This weekend, the Oklahoma City Thunder stands one game away from clinching a surprising spot in the NBA finals. But away from the roar of fans and the glare of cameras, another battle involving the basketball team is brewing in a probate courtroom in its home city. At stake is a roughly 20 percent interest in the Thunder held by Aubrey McClendon, the indebted Oklahoma energy magnate who died in a car crash on […]