Remove default constructor for folly::None
Summary: It's never useful to write `folly::None()` or `folly::None{}` instead of using `folly::none`, so disallow the former. This brings `folly::none` closer to `std::nullopt`. Reviewed By: yfeldblum Differential Revision: D12842421 fbshipit-source-id: 7a3526c8ab16cda8eed1c60650d2cae939c9f96a
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