Polish “Allow injection of StatsDClient into StatsdMetricWriter”

Closes gh-6588

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/statsd/StatsdMetricWriter.java

 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -64,7 +64,7 @@ public class StatsdMetricWriter implements MetricWriter, Closeable {
 	 */
 	public StatsdMetricWriter(String prefix, String host, int port) {
 		this(new NonBlockingStatsDClient(trimPrefix(prefix), host, port,
-			new LoggingStatsdErrorHandler()));
+				new LoggingStatsdErrorHandler()));
 	}
 
 	/**