Add missing providerID for sample shipping label predefined options

Author: itsmeichigo

WooCommerce/Classes/ViewRelated/Orders/Order Details/Shipping Labels/Create Shipping Label Form/Package Details/Multi-package/ShippingLabelPackagesFormViewModel.swift

@@ -284,13 +284,15 @@ extension ShippingLabelPackagesFormViewModel {
                                                                  isLetter: false,
                                                                  dimensions: "28.57 x 22.22 x 15.24")]
         let predefinedOption1 = ShippingLabelPredefinedOption(title: "USPS Priority Mail Flat Rate Boxes",
+                                                              providerID: "USPS",
                                                               predefinedPackages: predefinedPackages1)
 
         let predefinedPackages2 = [ShippingLabelPredefinedPackage(id: "LargePaddedPouch",
                                                                   title: "Large Padded Pouch",
                                                                   isLetter: true,
                                                                   dimensions: "30.22 x 35.56 x 2.54")]
         let predefinedOption2 = ShippingLabelPredefinedOption(title: "DHL Express",
+                                                              providerID: "DHL",
                                                               predefinedPackages: predefinedPackages2)
 
         return [predefinedOption1, predefinedOption2]