Remove redundant total setting

This is already getting done earlier. It was an error in refactoring
that led to it being called twice.

Author: jarednorman

core/app/models/spree/in_memory_order_updater.rb

@@ -237,7 +237,6 @@ def recalculate_line_item_prices
 
     def persist_totals
       shipments.each(&:persist_amounts)
-      assign_item_totals
       log_state_change("payment")
       log_state_change("shipment")
       order.save!