Camilla Blackett Guest ColumnistFor Variety‘s Writers on Writers, Camilla Blackett pens a tribute to “King Richard” (screenplay by Zach Baylin).Determined is a word you will hear many times when speaking of the Williams family and their hard-won Mount Olympus status in the world of tennis, but determination of sportsmanship is far from the only thing at play in Zach Baylin’s stunning “King Richard” script.More than anything, it is the determination of Black fatherhood that struck me most deeply