Fix typo in nginx.conf custom logging

roles/webserver/templates/nginx/nginx.conf.j2

@@ -80,7 +80,7 @@ http {
     log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                     '$status $body_bytes_sent "$http_referer" '
                     '"$http_user_agent" "$http_x_forwarded_for" '
-                    '$host ${request_time} ${scheme}"';
+                    '$host ${request_time} ${scheme}';
 
     ### Default log files ###