Added a load for 822header.js. Whoops.

Added a load for 822header.js, which is required for downloading a message body. Whoops.

xtrn/DDMsgReader/DDMsgReader.js

@@ -192,6 +192,7 @@ else
 	load("mouse_getkey.js");
 	load("html2asc.js");
 }
+load('822header.js');
 // This script requires Synchronet version 3.15 or higher.