3313342: Fixed php8.1 deprecation notice.

core/modules/layout_builder/layout_builder.module

@@ -158,7 +158,7 @@ function layout_builder_entity_view_alter(array &$build, EntityInterface $entity
   // If the entity is displayed within a Layout Builder block and the current
   // route is in the Layout Builder UI, then remove all contextual link
   // placeholders.
-  if ($route_name && $display instanceof LayoutBuilderEntityViewDisplay && strpos($route_name, 'layout_builder.') === 0) {
+  if ($route_name && $display instanceof LayoutBuilderEntityViewDisplay && str_starts_with($route_name, 'layout_builder.')) {
     unset($build['#contextual_links']);
   }
 }