HADOOP-16366. Fixed ProxyUserAuthenticationFilterInitializer for timeline server.

               Contributed by Prabhu Joseph

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/reader/TimelineReaderServer.java

@@ -165,10 +165,10 @@ public class TimelineReaderServer extends CompositeService {
           TimelineReaderAuthenticationFilterInitializer.class.getName())) {
         defaultInitializers.add(
             TimelineReaderAuthenticationFilterInitializer.class.getName());
-      } else {
-        defaultInitializers.add(
-            ProxyUserAuthenticationFilterInitializer.class.getName());
       }
+    } else {
+      defaultInitializers.add(
+          ProxyUserAuthenticationFilterInitializer.class.getName());
     }
 
     defaultInitializers.add(