Fix a variable name

templates/docker-compose.yml.twig

@@ -13,7 +13,7 @@ services:
     image: wodby/drupal-php:{{ php.version }}-2.0.0
     environment:
       PHP_SENDMAIL_PATH: /usr/sbin/sendmail -t -i -S mailhog:1025
-{% if php.debug %}
+{% if php.xdebug %}
       PHP_XDEBUG: 1
       PHP_XDEBUG_DEFAULT_ENABLE: 1
 {% endif %}