[webapp] fix the bug that xlog data api response with offset '0' when there are not any more xlogs to retrieve.

Author: gunlee01

scouter.webapp/src/main/java/scouterx/webapp/layer/controller/XLogDataController.java

@@ -120,6 +120,9 @@ public Response streamRealTimeXLog(@BeanParam @Valid final RealTimeXLogDataReque
         Consumer<JsonGenerator> realTimeXLogHandlerConsumer = jsonGenerator -> {
             try {
                 XLogCountBucket countBucket = new XLogCountBucket();
+                countBucket.setLoop(xLogRequest.getXLogLoop());
+                countBucket.setIndex(xLogRequest.getXLogIndex());
+
                 jsonGenerator.writeArrayFieldStart("xlogs");
 
                 XLogLoopCache.getOf(server.getId()).getAndHandleRealTimeXLog(