fix: accounting_webform save_account_id_key schema

modules/accounting_webform/config/schema/accounting_webform.schema.yml

@@ -8,6 +8,9 @@ webform.handler.accounting_account_webform_handler:
     account_submission_field:
       label: 'Account submission field'
       type: string
+    save_account_id_key:
+      label: 'Key for submission data to save created account id'
+      type: string
     payment_description:
       label: 'Payment description'
       type: string