[Bug][S300][bug-view-614][webui] fix adding the same rule to port filtering

Change-Id: I0a35906f96135ca650cd643fc70bd37e1fec8af7
diff --git a/lynq/S300/ap/app/zte_webui/js/net.js b/lynq/S300/ap/app/zte_webui/js/net.js
index b4866ce..fb1a2eb 100755
--- a/lynq/S300/ap/app/zte_webui/js/net.js
+++ b/lynq/S300/ap/app/zte_webui/js/net.js
@@ -900,6 +900,7 @@
 

         target.deleteFilterRules = deleteFilterRulesFunc;

 

+        target.clear();

         //init to call

         target.policyChangeHandler();