fix: validation considers moving average by default instead of set va… (backport #52246)

[mergify]

Reference support ticket

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This is an automatic backport of pull request #52246 done by Mergify.

[mergify]

Cherry-pick of 135a433 has failed:

On branch mergify/bp/version-15-hotfix/pr-52246
Your branch is up to date with 'origin/version-15-hotfix'.

You are currently cherry-picking commit 135a433018.
  (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/controllers/selling_controller.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/stock/doctype/delivery_note/test_delivery_note.py

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