Update SecurityViewModel.cs

Author: 0x5bfa

src/Files.App/ViewModels/Properties/SecurityViewModel.cs

@@ -5,6 +5,7 @@
 using Files.App.Filesystem;
 using Files.App.Filesystem.Security;
 using Files.App.Helpers;
+using Microsoft.UI.Xaml;
 using System.Threading.Tasks;
 using Windows.Storage;