Fixed typo in ECDSA384

[aritkulova]

• Since this PR suggests a bug fix, the tests have been added and the coverage is 100%.
• Since this PR introduces a new feature, the update has been discussed in an Issue or with the team.
• This PR is just a minor change, like a typo fix.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.79%. Comparing base (14773f4) to head (1d25e81).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #119   +/-   ##
=======================================
  Coverage   99.79%   99.79%           
=======================================
  Files          54       54           
  Lines        2969     2969           
  Branches      440      440           
=======================================
  Hits         2963     2963           
  Misses          6        6           

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[Arvolear]

LGTM!