57eda3ba30 musig: ctimetests: fix _declassify range for generated nonce points (Sebastian Falbesoner)
Pull request description:
As noticed in https://github.com/bitcoin-core/secp256k1/pull/1614#discussion_r1796215582, the area marked as non-secret exceeds the nonce_pts array in the second iteration of the for loop. Fix that by passing the correct size to the _declassify call.
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Tree-SHA512: ff8074e3d1078d66a52d08c661997856ff586b3b4564a865a75212b32fafd7906d58885371bd63005007fde554ebcad121ab66125abe4331cf0aac63fc018ed0