Layout builder integration treats 'teaser' view mode special

Problem

All view-modes should be equal. However, when layout-builder is enabled on the "manage display" default view mode, the following message appears on the "manage-ce" default view mode screen "Use layout builder" checkbox:

This is done for all view modes that don't have their own custom element display, except Teaser (which always use the below settings).

Proposed resolution

Remove special treatment.