Fix Checkstyle violations (post-merge)

Author: reta

systests/rs-sse/rs-sse-base/src/main/java/org/apache/cxf/systest/jaxrs/sse/BookStore.java

@@ -211,7 +211,7 @@ public void filtered(@Context SseEventSink sink) {
     @Path("/headers/sse")
     @Produces(MediaType.SERVER_SENT_EVENTS)
     public void headers(@Context SseEventSink sink) {
-    new Thread(() -> {
+        new Thread(() -> {
             try {
                 Thread.sleep(200);
                 sink.close();