Revert "Extend PercentageDiscountSet event by total and base values"

This reverts commit 4ce16b1.

Author: lukaszreszke

ecommerce/pricing/lib/pricing/events.rb

@@ -36,8 +36,6 @@ class PercentageDiscountSet < Infra::Event
     attribute :order_id, Infra::Types::UUID
     attribute :type, Infra::Types::String
     attribute :amount, Infra::Types::PercentageDiscount
-    attribute :base_total_value, Infra::Types::Price
-    attribute :total_value, Infra::Types::Price
   end
 
   class PriceItemAdded < Infra::Event