Michael Keaton reacted to the surprise cancellation of the “Batgirl” movie, which would have featured his return as Batman. “I think it was a business decision,” Keaton told reporters backstage at the Emmys, according to Variety. “I’m going to assume it was a good one. I really don’t know.” Keaton was set to star alongside Leslie Grace in “Batgirl,” which was expected to come out on HBO Max later this year before the cancellation was revealed last month. The film had a $90 million budget and was shelved for tax-write down purposes, according to The Hollywood Reporter. Keaton played the title s…