Remove redundant variable

Author: itsmeichigo

Modules/Sources/Yosemite/Model/Storage/Order+ReadOnlyConvertible.swift

@@ -82,7 +82,6 @@ extension Storage.Order: ReadOnlyConvertible {
         let orderCustomFields = customFields?.map { $0.toReadOnly() } ?? [Yosemite.MetaData]()
         let orderGiftCards = appliedGiftCards?.map { $0.toReadOnly() } ?? [Yosemite.OrderGiftCard]()
         let orderShippingLabels = shippingLabels?.map { $0.toReadOnly() } ?? [Yosemite.ShippingLabel]()
-        let orderShipments = shipments?.map { $0.toReadOnly() } ?? [Yosemite.WooShippingShipment]()
 
         return Order(siteID: siteID,
                      orderID: orderID,