Use obfuscated JS in BES

Author: mrjefftang

lib/msf/core/exploit/remote/browser_exploit_server.rb

@@ -501,7 +501,7 @@ def get_detection_html(user_agent)
 
       %Q|
       <script>
-      #{code}
+      #{js}
       </script>
       <noscript>
       <img style="visibility:hidden" src="#{get_resource.chomp("/")}/#{@noscript_receiver_page}/">