By Carla HintonStaff writerchinton@oklahoman.comTULSA — Supporters of a Black Lives Matter street mural on Greenwood Avenue said they are working on a solution to keep it there.Over the past weekend, the mural was defaced with blue paint but supporters of the street art remain undeterred.They said the mural's message of social justice particularly resonates in the Greenwood District where white mobs murdered hundreds of Blacks in 1921 in the prosperous community called "Black Wall Street" in what has become known as the Tulsa Race Massacre.That's why C.J.