Remove #to_package calls on shipment calculations

lib/spree/core/calculated_adjustments.rb

@@ -27,18 +27,12 @@ module Spree
           #   calculator as applied to the given calculable (Order, LineItems[], Shipment, etc.)
           # By default the adjustment will not be considered mandatory
           def create_adjustment(label, target, calculable, mandatory = false, state = "closed")
-            # Adjustment calculations done on Spree::Shipment objects MUST
-            # be done on their to_package'd variants instead
-            # It's only the package that contains the correct information.
-            # See https://github.com/spree/spree_active_shipping/pull/96 et. al
-            old_calculable = calculable
-            calculable = calculable.to_package if calculable.is_a?(Spree::Shipment)
             amount = compute_amount(calculable)
             return if amount.zero? && !mandatory
 
             adjustment_attributes = {
               amount: amount,
-              source: old_calculable,
+              source: calculable,
               originator: self,
               order: order_object_for(target),
               label: label,