Refactor methods for updating closed adjustments

app/models/spree/adjustment.rb

@@ -106,8 +106,8 @@ module Spree
     # more than on line items at once via accepted_nested_attributes the order
     # object on the association would be in a old state and therefore the
     # adjustment calculations would not performed on proper values
-    def update!(calculable = nil)
-      return if immutable?
+    def update!(calculable = nil, force: false)
+      return if immutable? && !force
 
       # Fix for Spree issue #3381
       # If we attempt to call 'source' before the reload, then source is currently

app/models/spree/order.rb

@@ -857,11 +857,8 @@ module Spree
     def update_adjustment!(adjustment)
       return if adjustment.finalized?
 
-      state = adjustment.state
-      adjustment.state = 'open'
-      adjustment.update!
+      adjustment.update!(force: true)
       update!
-      adjustment.state = state
     end
 
     # object_params sets the payment amount to the order total, but it does this