R1:fe29db6b92de

Use shouldAllowPublic(), not shouldRequireLogin(), for Legalpad

Summary: This got written a while ago and is using slightly incorrect gating on logged-out users. The names of these methods should probably be more clear too, but basically "shouldAllowPublic()" is for "this page may be usable to logged-out users, if policies allow it", while "shouldRequireLogin()" is for "this page should skip various credential checks". One of the skipped checks is email verification. This method should maybe be something…