fix(drag-drop): DOM element not being returned to initial container on drop #12948
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Currently when an item is dropped, we return it to its initial position in the DOM so Angular can take over and re-render it if necessary, however this breaks down if the item is the only child of the drop container and we weren't able to grab a reference element that we can use to restore its position. These changes address the issue by using the initial drop container as a reference.
Fixes #12944.