fix broken example

contrib/nginx/radicale.conf

@@ -21,7 +21,6 @@ location /radicale/ {
 ## Base URI: /
 #location / {
 #    proxy_pass        http://localhost:5232/;
-#    proxy_set_header  X-Script-Name /radicale;
 #    proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
 #    proxy_set_header  X-Forwarded-Host $host;
 #    proxy_set_header  X-Forwarded-Port $server_port;