From Subhash Ghai to “Bidhu” Vinod Chopra to Sanjay Leela Bhansali, the unlikely ‘filmi’ students of the Film and Television Institute of India where Ghatak taught for all of two years, keep his legacy alive in unmissable ways. There is also Payal Kapadia, as non-Bollywood as it can get, who mentions his influence on her work The film lovers’ conventional…