Remove "inactive" status for now, use "draft" instead

[MAILPOET-4757]

mailpoet/lib/Automation/Engine/Data/Workflow.php

@@ -9,13 +9,11 @@ use MailPoet\Automation\Engine\Utils\Json;
 class Workflow {
   public const STATUS_ACTIVE = 'active';
   public const STATUS_DEACTIVATING = 'deactivating';
-  public const STATUS_INACTIVE = 'inactive';
   public const STATUS_DRAFT = 'draft';
   public const STATUS_TRASH = 'trash';
   public const STATUS_ALL = [
     self::STATUS_ACTIVE,
     self::STATUS_DEACTIVATING,
-    self::STATUS_INACTIVE,
     self::STATUS_DRAFT,
     self::STATUS_TRASH,
   ];