fix: styling of group by button (backport #21520)

[mergify]

This is an automatic backport of pull request #21520 done by Mergify.
Cherry-pick of 85145c2 has failed:

On branch mergify/bp/version-13-hotfix/pr-21520
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	both modified:   frappe/public/scss/desk/report.scss

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[frappe-pr-bot]

🎉 This PR is included in version 13.57.4 🎉

The release is available on GitHub release

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