Revert "Get currency through order, not global config"
Revert "Get currency through order, not global config"

This reverts commit 9a6f125b37fc7582c15de51100b072727d804e3e.

Commit is in a different order in stickermule-02-2017, thus conflicting sha

printbear/better_spree_paypal_express,printbear/better_spree_paypal_express,printbear/better_spree_paypal_express