Update test setup in checkout helper spec

spec/helpers/checkout_helper_spec.rb

@@ -40,6 +40,7 @@ describe CheckoutHelper, type: :helper do
     }
 
     before do
+      order.update!
       # Sanity check initial adjustments state
       expect(order.shipment_adjustments.count).to eq 1
       expect(order.adjustments.enterprise_fee.count).to eq 1