Removing MinWidth defaults for CheckBox and RadioButton

Removed the MinWidth default values (120) for CheckBox and RadioButton to resolve #5355

src/Avalonia.Themes.Fluent/Controls/CheckBox.xaml

@@ -11,7 +11,6 @@
     <Setter Property="HorizontalContentAlignment" Value="Left" />
     <Setter Property="VerticalContentAlignment" Value="Center" />    
     <Setter Property="FontSize" Value="{DynamicResource ControlContentThemeFontSize}" />
-    <Setter Property="MinWidth" Value="120" />
     <Setter Property="MinHeight" Value="32" />
     <!--<Setter Property="UseSystemFocusVisuals" Value="{StaticResource UseSystemFocusVisuals}" />
     <Setter Property="FocusVisualMargin" Value="-7,-3,-7,-3" />-->

src/Avalonia.Themes.Fluent/Controls/RadioButton.xaml

@@ -19,7 +19,6 @@
     <Setter Property="HorizontalContentAlignment" Value="Left" />
     <Setter Property="VerticalContentAlignment" Value="Center" />    
     <Setter Property="FontSize" Value="{DynamicResource ControlContentThemeFontSize}" />
-    <Setter Property="MinWidth" Value="120" />
     <Setter Property="Template">
       <ControlTemplate TargetType="RadioButton">
         <Border Name="RootBorder"