fix(sales order): incorrect no. of items fetched while creating dn (backport #29454)

[mergify]

This is an automatic backport of pull request #29454 done by Mergify.
Cherry-pick of a73ad67 has failed:

On branch mergify/bp/version-13-hotfix/pr-29454
Your branch is up to date with 'origin/version-13-hotfix'.

You are currently cherry-picking commit a73ad6759d.
  (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)

Changes to be committed:
	modified:   erpnext/selling/doctype/sales_order/sales_order.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/selling/doctype/sales_order/sales_order.js

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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