style: improve test names of GetEuclidGCD

[vil02]

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Describe your change:

While working on #1645 I have discovered '%o'. I decided to use it here. It should have been done in #1642.

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new JavaScript files are placed inside an existing directory.
• All filenames should use the UpperCamelCase (PascalCase) style. There should be no spaces in filenames.
  Example:UserProfile.js is allowed but userprofile.js,Userprofile.js,user-Profile.js,userProfile.js are not
• All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.07%. Comparing base (bd34e9f) to head (f49f82c).

Additional details and impacted files

@@ Coverage Diff @@ ## master #1646 +/- ## ======================================= Coverage 84.07% 84.07% ======================================= Files 375 375 Lines 19688 19688 Branches 2913 2913 ======================================= Hits 16552 16552 Misses 3136 3136 

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