Remove obsolete IP from nginx config

site-cookbooks/kosmos_discourse/templates/nginx_conf.erb

@@ -18,7 +18,6 @@ server {
 
   # Send real IP to the Docker container
   set_real_ip_from 127.0.0.1;
-  set_real_ip_from 172.17.0.1;
   real_ip_header X-Forwarded-For;
 
   client_max_body_size 20M;