Change default Plan Type to Paid

[brianhogg]

Is your feature request related to a problem? Please describe.
Those who are using the WooCommerce integration are confused by the WooCommerce Product dropdown not appearing when creating a new access plan.

Describe the solution you'd like
Previously the "is free" checkbox was unchecked, meaning the access plan was a paid one. Switching the default back to Paid would keep the same UX.

Describe alternatives you've considered
N/A