Setting order status to error on failed payment

[dparker1005]

All Submissions:

• Have you followed the Contributing guidelines?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Noting the date that an order is cancelled (as the query above expects that data to be there) and now setting the order status to "Error" to discourage admins from later trying to switch it to success, even though the user has already lost their membership.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully run tests with your changes locally?

Changelog entry

Enter a summary of all changes on this Pull Request. This will appear in the changelog if accepted.