fix: delivery note from sales order uom conversion mistake (backport #46258)

[mergify]

fixes #46196

---

This is an automatic backport of pull request #46258 done by Mergify.

[mergify]

Cherry-pick of 49a43d3 has failed:

On branch mergify/bp/version-15-hotfix/pr-46258
Your branch is up to date with 'origin/version-15-hotfix'.

You are currently cherry-picking commit 49a43d355d.
  (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/doctype/sales_order/sales_order.py

no changes added to commit (use "git add" and/or "git commit -a")

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