fix clean deployment nginx configuration

deploy/nginx/templates/tls.conf.template

@@ -4,7 +4,6 @@ server_tokens off;
 reset_timedout_connection on;
 client_header_timeout 15s;
 client_body_timeout 60s;
-keepalive_timeout 30s;
 send_timeout 60s;
 
 limit_conn_zone $binary_remote_addr zone=per_address_connections:10m;