Populate "Payment method" with Vendor payment method if available

Overview: Organization records contain the primary payment method for the Vendor. When creating an invoice for that vendor ideally the payment method is pre populated but can be changed if needed.

Acceptance criteria:
Given user is creating invoice
When selecting a Vendor
IF that vendor has a "Payment method" selected under vendor information
Then that payment method is selected automatically in the invoice payment method select list
AND the user can edit it if needed.