Disabling Coupons Doesn’t hide the Coupon Code Option in the Checkout Block

[igotdes]

Describe the bug

Even when coupons are disabled under WooCommerce > Settings > General, there is still an option to add a coupon in the Checkout block.

To reproduce

Steps to reproduce the behavior:

1. Under WooCommerce > Settings > General, make sure that "Enable coupons" is unchecked
2. Create a page, add a Checkout block to it, and save it
3. View the page from the front end

Expected behavior

The option to add a coupon should be hidden.

Screenshots

Coupons Are Disabled In General Settings

Coupons Are Still an Option in the Checkout Block

Environment

WordPress:

• Core version: 5.7.1
• WooCommerce version: 5.2.2
• WooCommerce Blocks version: 5.1.0
• Site language: en_US
• Any other plugins installed:
  • Companion Plugin: by Osk – 1.18

Desktop:

• OS: macOS 11.3.1 (20E241)
• Browser: Chrome 90.0.4430.93 (Official Build) (x86_64)

Additional context

• This was reported in this WooCommerce Blocks forum thread on WordPress.org
• A JN site displaying the issue can be seen here. It will be destroyed around May 18, 2021. For ease of checking, there's a link there in the menu to a page with a Checkout block.

[Aljullu]

Confirming the issue, thanks for opening it @igotdes!

It seems to be a regression introduced in 5.0 (particularly, in this PR: #4059).