Correct Files license header

Author: hez2010

src/Files.App/ViewModels/UserControls/Previews/ShellPreviewViewModel.cs

@@ -1,5 +1,5 @@
-// Copyright (c) 2024 Files Community
-// Licensed under the MIT License. See the LICENSE.
+// Copyright (c) Files Community
+// Licensed under the MIT License.
 
 using Files.App.ViewModels.Properties;
 using Microsoft.UI.Content;