Fix a warning in the config

Migrate the web admin to a request handler

site-cookbooks/kosmos-ejabberd/templates/ejabberd.yml.erb

@@ -64,6 +64,7 @@ listen:
       "/bosh": mod_bosh
       "/api": mod_http_api
       "/upload": mod_http_upload
+      "/admin": ejabberd_web_admin
     custom_headers:
       "Access-Control-Allow-Origin": "*"
       "Access-Control-Allow-Methods": "OPTIONS, HEAD, GET, PUT"
@@ -71,7 +72,6 @@ listen:
       "Access-Control-Allow-Credentials": "true"
     tls: true
     ##  "/pub/archive": mod_http_fileserver
-    web_admin: true
     ## register: true
     captcha: false