std.crypto.ed25519 incremental signatures: hash the fallback noise (#13643)

If the noise parameter was null, we didn't use any noise at all.

We unconditionally generated random noise (`noise2`) but didn't use it.

Spotted by @cryptocode, thanks!
ee8af8cffbFrank Denis committed on 12/22/2022, 10:06:28 PM· committed by Frank Denisparent3ee5cf6
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