🔎 Isolate the bug

• [x ] I have confirmed this occurs in the most recent version of WordPress, WooCommerce, and Facebook for WooCommerce.
• [x ] I have confirmed this occurs when only WooCommerce and Facebook for WooCommerce are active and when using a default WordPress or WooCommerce theme.

✍️ Describe the bug

If a user has checked the "Hide out of stock items from the catalog" option in WooCommerce (WooCommerce -> settings -> Products -> inventory), out-of-stock variable products are not deleted from Facebook

🚶‍♀️ Steps to reproduce

1. Make sure the "Hide out of stock items from the catalog" option in WooCommerce (WooCommerce -> settings -> Products -> inventory) is checked
2. Edit a product and set the stock quantity to 0.
3. The product is still visible on the Facebook Catalog

✔️ Expected behavior

The product should be removed from the FB catalog

Related to #2245