Fix test broken by additional customizer

See gh-16498

Author: philwebb

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/reactive/ReactiveWebServerFactoryAutoConfigurationTests.java

@@ -68,7 +68,7 @@ public void createFromConfigClass() {
 					assertThat(context.getBeansOfType(ReactiveWebServerFactory.class))
 							.hasSize(1);
 					assertThat(context.getBeansOfType(WebServerFactoryCustomizer.class))
-							.hasSize(1);
+							.hasSize(2);
 					assertThat(context
 							.getBeansOfType(ReactiveWebServerFactoryCustomizer.class))
 									.hasSize(1);