Order field in page API not working on root level

[timobrembeck]

Describe the Bug

We use the lft field of the MPTT model to convert them to order fields which is used by the app.
However, on the root level this does not work, because all root pages have the same lft values.

Steps to Reproduce

Access API and inspect root pages

Expected Behavior

The root pages should be ordered by their tree ids

Actual Behavior

All root pages have the order field 1 because it's their lft value