Issue #3165010 follow-up: Using the layout builder discard changes button...

Issue #3165010 follow-up: Using the layout builder discard changes button should ignore any input and skip validation

core/modules/layout_builder/tests/src/Functional/LayoutBuilderFormModeTest.php

@@ -29,7 +29,7 @@ class LayoutBuilderFormModeTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  protected $defaultTheme = 'classy';
+  protected $defaultTheme = 'stark';
 
   /**
    * {@inheritdoc}