fix double logging

Author: marschall

src/test/resources/log4j2-test.xml

@@ -9,8 +9,6 @@
     <Root level="WARN">
       <AppenderRef ref="Console" />
     </Root>
-    <Logger name="net.ttddyy.dsproxy.listener.logging.SLF4JQueryLoggingListener" level="DEBUG">
-      <AppenderRef ref="Console" />
-    </Logger>
+    <Logger name="net.ttddyy.dsproxy.listener.logging.SLF4JQueryLoggingListener" level="DEBUG"/>
   </Loggers>
 </Configuration>