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!
feb806a212Frank Denis committed on 11/24/2022, 11:13:37 AM· committed by GitHubparent02e1fac
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