Fix config name drupal_db_name (acquia#597)

Author: dpagini

scripts/drupal-vm/config.yml

@@ -26,7 +26,7 @@ drupal_core_path: "{{ drupal_composer_install_dir }}/docroot"
 
 drupal_db_user: drupal
 drupal_db_password: drupal
-drupal_db_database: drupal
+drupal_db_name: drupal
 
 # Set this to 'false' if you don't need to install drupal (using the drupal_*
 # settings below), but instead copy down a database (e.g. using drush sql-sync).