[warningsAsErrors] Getting settings online (#6053)

* getting everything to compile

* fixing json

src/core/Microsoft.PowerToys.Settings.UI.Lib/KeyboardManagerProfile.cs

@@ -2,7 +2,6 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-using System.Collections.Generic;
 using System.Text.Json.Serialization;
 
 namespace Microsoft.PowerToys.Settings.UI.Lib