Use system default currency as default POL currency (Remove org limit)

Overview: when creating purchase orders and inputting cost information it is helpful to be able to select any currency for each POL.

Acceptance criteria:
Given user has created PO
When adding cost information to POL
Then default currency selected is the system currency from tenant settings

Given user has created PO
When adding/editing cost information for POL
Then currency select list includes all possible currencies
AND is not filtered based on Vendor