Slug of a non direct child of home page is not beeing updated with the title field

## To Reproduce

Take into account that this will happen when you create a page which is NOT a direct child of home page

1. Go to 'Manage Pages'
2. Click on 'New page'
3. Erase the whole title and start writting a new one
4. See that the slug is not been updated automatically with the new title
5. Try to update the slug manually, you won't be able to add a slash (/)

## Expected behavior
The slug is updated automatically when you change the title

## Describe the bug

## Video reproducing issue
[Slug bug creating new page.webm](https://user-images.githubusercontent.com/18350276/219330237-1486f7a6-ffaf-4529-9350-545ed47c4b99.webm)

## Details

**Version of Node.js:**
v16.19.0

**Server Operating System:**
Ubuntu 19.04

Start in Manage Pages and reproduce the issue by creating a page that is not a direct child of the home page, then changing its title. Verify both automatic slug updates and manual slash entry; the work is done when the slug follows the new title and nested paths can be edited.

Written by the indexing model from the issue text.