fix: no negative currency cash register

[a2937]

Checklist:

• [X] I have read freeCodeCamp's contribution guidelines.
• [X] My pull request has a descriptive title (not a vague title like Update index.md)

Closes #559

[a2937]

Is there still a merge conflict on this PR?

[a2937]

I linted the file so this can finally be merged.

[gikf]

Hey @a2937

Thank you for opening this pull request.

As there was different PR - #602 - addressing linked issue merged recently, we are going to close this one.

Thank you and happy coding! 😊

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