[chore] cleanup 'using' statements (#10144)

fix typo in comment

src/modules/colorPicker/ColorPickerUI/Keyboard/KeyboardMonitor.cs

@@ -5,7 +5,6 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel.Composition;
-using System.Diagnostics;
 using System.Windows.Input;
 using ColorPicker.Helpers;
 using ColorPicker.Settings;