Add 'drupal' ProjectType in expand-composer-json (#48)

The 'drupal' ProjectType was introduced in ddev v1.23.0 and will eventually replace drupal8, drupal9, and drupal10 ProjectTypes.

commands/web/expand-composer-json

@@ -5,7 +5,7 @@
 ## Description: Add Drupal core and other needed dependencies.
 ## Usage: expand-composer-json [flags] [PROJECT_NAME]
 ## Example: "ddev expand-composer-json ctools"
-## ProjectTypes: drupal8,drupal9,drupal10
+## ProjectTypes: drupal,drupal8,drupal9,drupal10
 ## ExecRaw: true
 
 export _WEB_ROOT=$DDEV_DOCROOT