ed448-goldilocks: don't reduce points during decompression
#1462
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RFC 8032 specifies that points shouldn't be just reduced during de-serialization.
This PR changes
CompressedEdwardsY::decompress()to not reduce the point.Additionally,
CompressedDecaf::decompress()was reducing the point and then checking if the original point was reduced. The check if the point is reduced in the first place is much cheaper.Related: dalek-cryptography/curve25519-dalek#626.