Submissions export fails when Entity autocomplete element type is disabled

I have Entity autocomplete element type disabled and when I try to make an export of the submissions, it fails.

There is an export field 'uid' which is an entity_reference and because of that, it tries to load the entity_autocomplete plugin during export. This plugin requires some form-options to be set and those are not present.

I have made a little fix in WebformEntityReferenceTrait that defaults to the default settings.