Gene Maddaus Senior Media Writer“Joker” was a very New York movie — so much so that tourists flocked to the Bronx staircase where Joaquin Phoenix danced in a montage.But the sequel, “Joker: Folie á Deux,” will shoot in Los Angeles, thanks to $12.6 million in tax credits to Warner Bros. from the state of California.The California Film Commission announced its latest round of credit allocations on Monday morning, awarding $93.7 million to 18 projects.