Builds should not define a shortened config version

[Reinmar]

I tried to create an editor (using the classic build):

return ClassicEditor
	.create( document.querySelector( '#snippet-classic-editor' ), {
		toolbar: {
			viewportTopOffset: 60
		}
	} )

Which didn't work well because no toolbar items were rendered. This is because the build specifies config.toolbar = [ 'item1', 'item2' ... ] so setting that to the object format overrides the value completely.

Instead, if the build will configure config.toolbar.items = [ ... ] everything will work fine.

[Reinmar]

Of course, if we configure toolbar items through config.toolbar.items one can still override them easily through config.toolbar (using the simplified format).

[Reinmar]

Closed with:

• ckeditor/ckeditor5-build-classic@e7fbda9
• ckeditor/ckeditor5-build-balloon@c2485d6
• ckeditor/ckeditor5-build-inline@f974881