update sample setup code

strangerstudios / pmpro-sponsored-members

Generate a discount code for a main account holder to distribute to sponsored members.

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Closed kimwhite closed 1 year ago

kimwhite commented 3 years ago

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

Change sample code to use child-level instead of itself.