Block List: single block type create label

[nielslyngsoe]

when only one block type available then use the Content Type name of it. This changes so it instead of using label, then it should use the content type name,

Types of changes

• [x] 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.