Revert: add child item groups into the filters (backport #27266)

[mergify]

Reverts #26997

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This is an automatic backport of pull request #27266 done by Mergify.

[mergify]

Cherry-pick of 763450d has failed:

On branch mergify/bp/version-13-hotfix/pr-27266
Your branch is up to date with 'origin/version-13-hotfix'.

You are currently cherry-picking commit 763450dcf8.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/selling/report/sales_partner_target_variance_based_on_item_group/item_group_wise_sales_target_variance.py

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