chore: Adjust not_win usage

Author: MartinZikmund

components/RangeSelector/src/RangeSelector.xaml

@@ -3,7 +3,9 @@
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                     xmlns:controls="using:CommunityToolkit.WinUI.Controls"
                     xmlns:not_win="http://uno.ui/not_win"
-                    xmlns:win="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+                    xmlns:win="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+                    mc:Ignorable="not_win">
 
     <Style BasedOn="{StaticResource DefaultRangeSelectorStyle}"
            TargetType="controls:RangeSelector" />