Set the uploads dir inside of /opt/ejabberd instead of /var/www

/var/www is intended for nginx/apache

I have copied over the old directories manually on Andromeda before
running this code

Fixes #80

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

@@ -208,7 +208,7 @@ modules:
         urls: ["mailto:abuse@@HOST@"]
   mod_bosh: {}
   mod_http_upload:
-    docroot: "/var/www/xmpp.@HOST@/uploads/"
+    docroot: "/opt/ejabberd/uploads/xmpp.@HOST@/"
     put_url: "https://xmpp.@HOST@:5443/upload"
     thumbnail: false # otherwise needs the identify command from ImageMagick installed
   mod_last: {}