Fix: Block Grid Editor — Move between areas and root (A Sorter Controller Fix)

[nielslyngsoe]

This PR fixes an issue where the sorter would get stuck when moving from root to an area or from an area to the root.

As you will notice the PR does not change any code of the Block Grid Editor, but the Sorter as the problem was that the Sorter did not handle if the model changed leaving the active entry data undiscoverable by instance.
Basically because our models are immutable we will get new objects when retrieving an update of our model.
This PR changes so the sorter used latest entry of the model and fixes the issue by that.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (minor updates related to the tooling or maintenance of the repository, does not impact compiled assets)

Motivation and context

How to test?

Screenshots (if appropriate)

Checklist

• If my change requires a change to the documentation, I have updated the documentation in this pull request.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.