Why the hell would they change a Stephen King story title? Lisey's Story might not be one of his most recognizable story titles, but if a person googles "Lisey's Story" it immediately returns results relevant to King's book, and would in turn return results relevant to the show. Whereas googling "Faces" is damn near useless.
I cant help but suspect this is the result of Apple's typical "Our way is the only way." company BS. Instead of using King's title they have to come up with their own title. Just like instead of using industry standard electronic ports and cables they have to be arbitrarily difficult and make their own BS ports and cables that only work with their overpriced hardware.