Fix LED layout Preview (#1813)

Author: Lord-Grey

assets/webconfig/js/content_leds.js

@@ -978,7 +978,7 @@ $(document).ready(function () {
     //Only update Image, if LED Layout Tab is visible
     if (onLedLayoutTab && window.imageStreamActive) {
       setClassByBool('#leds_prev_toggle_live_video', window.imageStreamActive, "btn-danger", "btn-success");
-      var imageData = (event.response.result.image);
+      var imageData = (event.response.data.image);
 
       var image = new Image();
       image.onload = function () {