fix: Incorrect field while calculating Tax withholding net total (backport #35733)

[mergify]

This is an automatic backport of pull request #35733 done by Mergify.
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	both modified:   erpnext/accounts/doctype/tax_withholding_category/tax_withholding_category.py

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[frappe-pr-bot]

🎉 This PR is included in version 13.51.4 🎉

The release is available on GitHub release

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