Set the packagepath when saving the SK file - as need to know the location when we fetch it in next install step

src/Umbraco.Web/Install/InstallSteps/StarterKitDownloadStep.cs

@@ -70,6 +70,8 @@ namespace Umbraco.Web.Install.InstallSteps
             //add an entry to the installedPackages.config
             var compiledPackage = _packageService.GetCompiledPackageInfo(packageFile);
             var packageDefinition = PackageDefinition.FromCompiledPackage(compiledPackage);
+            packageDefinition.PackagePath = packageFile.FullName;
+            
             _packageService.SaveInstalledPackage(packageDefinition);
 
             InstallPackageFiles(packageDefinition, compiledPackage.PackageFile);