fix(eslint-plugin): correct message for no-unsafe-unary-minus

[samestep]

Followup to #7390 since I realized that the error message is wrong.

PR Checklist

• Addresses an existing open issue
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

This PR corrects the error message for the no-unsafe-unary-minus rule.

[typescript-eslint]

Thanks for the PR, @samestep!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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[JoshuaKGoldberg]

Whoops! Thanks for the catch :)