Fix checkstyle issue

Author: philwebb

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/log4j2/Log4J2LoggingSystem.java

@@ -242,9 +242,7 @@ private Map<String, LoggerConfig> getAllLoggers() {
 		for (Logger logger : getLoggerContext().getLoggers()) {
 			addLogger(loggers, logger.getName());
 		}
-		getLoggerContext().getConfiguration().getLoggers().keySet().forEach((name) -> {
-			addLogger(loggers, name);
-		});
+		getLoggerContext().getConfiguration().getLoggers().keySet().forEach((name) -> addLogger(loggers, name));
 		return loggers;
 	}