allow conversion from nullptr to folly::Optional<bool>
Summary: Disabling the nullptr conversion to non-pointer folly::Optional<T> has baked long enough. Re-enabled it with the same behavior that std::optional has. Reviewed By: Orvid Differential Revision: D15151503 fbshipit-source-id: d170f3f0e6bf3bb4461f17bdb6f8078b5a883615
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