[FIX] sale_coupon: unvalid next_order programs if needed

Before this commit:
We would never unvalid a `next_order` program (and thus it's generated coupon)

Now:
We also retrieve applied `next_order` programs as we need to check if they are
still valid too

Step to reproduce:
  - Create a program on `next_order` that require $300
  - Add $300 worth of product on a SO
  - Apply program, it will generate a coupon
  - Make the SO total go below $300
  - The generated coupon is still Valid and the client will receive that coupon
    even if it is not supposed to anymore

Closes #3062

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