Update cnames_active.js

Co-authored-by: Matt Cowley <me@mattcowley.co.uk>

Author: nathanclevenger

cnames_active.js

@@ -1925,7 +1925,7 @@ var cnames_active = {
   "md": "cname-china.vercel-dns.com", // noCF
   "md5": "cname-china.vercel-dns.com", // noCF
   "mdbf-css": "more-beautiful-div-framework.github.io",
-  "mdxe": "vercel-dns.com", // noCF
+  "mdxe": "cname.vercel-dns.com", // noCF
   "mdcdev": "galleniz.github.io/mdcdev.js",
   "mde": "lukehorvat.github.io/mde-soundboard",
   "mechan": "dusterthefirst.github.io/mechan.js",