[fix] the subscribe form display the incorrect data (#13)

frontend/src/pages/Subscribers/components/SubscriberModal.js

@@ -134,7 +134,7 @@ function sliceConfigurationsFromSubscriber(subscriber) {
           }
         })
       }
-      if (dnnConfigs[dnn].upSecurity !== null){
+      if (dnnConfigs[dnn].upSecurity){
         return {
           dnn: dnn,
           uplinkAmbr: dnnConfigs[dnn].sessionAmbr.uplink,