By Lawrence Hurley WASHINGTON (Reuters) -The U.S. Supreme Court, in the latest in a spate of decisions expanding religious liberty, ruled on Monday that a Washington state public school district violated the rights of a Christian high school football coach who was suspended for refusing to stop leading prayers with players on the field after games. Broadening the religious rights of government employees, the justices sided with Joseph Kennedy, who until 2015 served as a part-time assistant football coach in the city of Bremerton and has since become a cause celebre for conservative Christian a…