[BUGFIX] Declare username and password as arguments

.ddev/config.yaml

@@ -13,7 +13,7 @@ provider: default
 hooks:
   post-import-db:
   - exec: vendor/bin/typo3cms database:updateschema
-  - exec: vendor/bin/typo3cms backend:createadmin --username=admin --password=password
+  - exec: vendor/bin/typo3cms backend:createadmin admin password
   post-start:
   - exec: cp private/typo3conf/AdditionalConfiguration.ddev.php private/typo3conf/AdditionalConfiguration.php
   - exec: composer install