Fix ship_address_same_as_billing checkbox value with string

app/assets/javascripts/darkswarm/controllers/checkout/checkout_controller.js.coffee

@@ -9,9 +9,10 @@ Darkswarm.controller "CheckoutCtrl", ($scope, storage, Checkout, CurrentUser, Cu
   for field in $scope.fieldsToBind
     storage.bind $scope, "Checkout.order.#{field}",
       storeName: "#{prefix}_#{field}"
+
   storage.bind $scope, "Checkout.ship_address_same_as_billing",
     storeName: "#{prefix}_sameasbilling"
-    defaultValue: true
+    defaultValue: 'YES'
 
   $scope.order = Checkout.order # Ordering is important
   $scope.secrets = Checkout.secrets

app/assets/javascripts/darkswarm/services/checkout.js.coffee

@@ -3,7 +3,7 @@ Darkswarm.factory 'Checkout', (CurrentOrder, ShippingMethods, PaymentMethods, $h
     errors: {}
     secrets: {}
     order: CurrentOrder.order
-    ship_address_same_as_billing: true
+    ship_address_same_as_billing: 'YES'
 
     submit: ->
       Loading.message = t 'submitting_order'
@@ -33,7 +33,7 @@ Darkswarm.factory 'Checkout', (CurrentOrder, ShippingMethods, PaymentMethods, $h
           else
             # Ignore everything else
 
-      if @ship_address_same_as_billing
+      if @ship_address_same_as_billing == 'YES'
         munged_order.ship_address_attributes = munged_order.bill_address_attributes
         # If the order already has a ship and bill address (as with logged in users with
         # past orders), and we don't remove id here, then this will set the wrong id for