UI wrongly tells the layout is for view-mode default

Problem

Wrong message output

Steps to reproduce

* Add new content type
* Manage display for default, teaser + enable layout builder for default and teaser
* Customize CE output for default and teaser. For teaser enable layout builder.

It wrongly says:
> Note this is the layout for view mode default, not teaser_text.

This is only true, when the fallback on default is in place. But once it isn't, it's wrong.