Remove "ssl on" from nginx.conf

Fix unknown directive error.

Author: shingo78

auth-proxy/resources/etc/templates/nginx.conf.j2

@@ -53,7 +53,6 @@ http {
         root /var/www/htdocs;
         index login.php logout.php;
 
-        ssl on;
         ssl_certificate "/etc/nginx/certs/auth-proxy.chained.cer";
         ssl_certificate_key "/etc/nginx/certs/auth-proxy.key";