fix: apply discount on item after applying price list (backport #36125)

[mergify]

This is an automatic backport of pull request #36125 done by Mergify.
Cherry-pick of bde9e89 has failed:

On branch mergify/bp/develop/pr-36125
Your branch is up to date with 'origin/develop'.

You are currently cherry-picking commit bde9e89582.
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Unmerged paths:
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	both modified:   erpnext/public/js/controllers/transaction.js
	deleted by us:   erpnext/selling/sales_common.js

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/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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