gdu: remove conflict with coreutils

[dundee]

the binary was renamed

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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[dundee]

Please add CI-syntax-only label.

[carlocab]

Thanks. Could you split your commit into two? Each commit should only modify exactly one formula.

[dundee]

Thanks. Could you split your commit into two? Each commit should only modify exactly one formula.

Sure, done. Thanks!

[carlocab]

Thanks so much!