Fix Ecdsa.testBias

[francescomari]

Fix the way Ecdsa.testBias iterates over the signature logic. Simplify the aggregation of the test results.

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[francescomari]

I signed the CLA.

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CLAs look good, thanks!

[thaidn]

This was merged in d8ed1ba.

GitHub should show you as the author of the commit, but somehow the authoring information was lost when I copied the change from our internal repo. I'm so sorry, but I don't know how to fix this.