Fix create child issue in list view with infinite editor (#13355).

[mvennevold]

Prerequisites

• I have added steps to test this contribution in the description below

If there's an existing issue for this PR then this fixes #13355

Description

The linked issue is for v10 but I ran into the same issue in 13.5.2.

Based on @dKumarmj 's analysis in the issue I have tried to fix the problem.

Instead of using the id in the route to fetch the allowed child items we should use the contentId from the scope which represents the active item in the infinite editor.

With this fix in place the repro steps in the issue now work as expected, i.e. it is possible to create a third level item under the second level.

[github-actions]

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[mikecp]

Hello @mvennevold !

Thanks for providing a fix for this issue on V13 👍
A member of the core collaborators team will evaluate it soon.

In the meantime, I noticed this is your first contribution to the Umbraco CMS. Thank you and congratulations😁 !!
If you have an account on Our.umbraco.com, you can already mention it here, so that we'll be able to assign you our shiny contributor's badge once your PR is merged 😉

[AndyButland]

I've tested this and can confirm it resolves the issue, thanks very much @mvennevold.