Polish "Align MustacheViewResolver with other similar resolvers"

See gh-24011

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/view/MustacheViewResolver.java

@@ -77,7 +77,7 @@ public class MustacheViewResolver extends AbstractTemplateViewResolver {
 
 	@Override
 	protected AbstractUrlBasedView instantiateView() {
-		return (getViewClass() == MustacheView.class ? new MustacheView() : super.instantiateView());
+		return (getViewClass() == MustacheView.class) ? new MustacheView() : super.instantiateView();
 	}
 
 }