fix: remove typo from SalaryCalculatorTest.java

[mattcristal]

pull request

What was done

• Removed a typo from a variable name found whilst reading the test cases.
• Formatting was done via: https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-java-pack

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This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

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[manumafe98]

Thanks for the PR @mattcristal !