Disable sorting of (files) app links with navbar customizations

[robinkar]

It would be nice to have the possibility of disabling or customizing the sorting of nav_bar entries/subcategories in some cases.

In our case, we have a list of favorite paths for the files app, which we populate in the dashboard initializer in the order we would like them to appear, for example:

However, after customizing the navbar, this is now automatically sorted to:

The navbar above is specified as:

nav_bar:
  - files

It seems like #3344 introduced the automatic sorting of the menu entries.