Give option to remove the postal code requirement

Postal code is a required payment field for merchants based in the United States, Canada, and United Kingdom. For merchants based outside those locations, there should be an option to remove the requirement.

Refer to the Square API Documentation for instruction:

https://docs.connect.squareup.com/payments/sqpaymentform/sqpaymentform-setup#optional-remove-the-postal-code-requirement