Delete second stop_service, the mixin should had done the job

Author: jvazquez-r7

modules/auxiliary/gather/apple_safari_ftp_url_cookie_theft.rb

@@ -154,9 +154,6 @@ def on_client_command_retr(c, arg)
   def cleanup
     super
 
-    # Kill FTP
-    stop_service
-
     # clear my resource, deregister ref, stop/close the HTTP socket
     begin
       @http_service.remove_resource(datastore['URIPATH'])