update backers

src/Shared/HandyControlDemo_Shared/UserControl/Main/AppNotification.xaml

@@ -2,7 +2,6 @@
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:hc="https://handyorg.github.io/handycontrol"
-             xmlns:ex="clr-namespace:HandyControlDemo.Tools.Extension"
              Background="White"
              BorderThickness="1"
              BorderBrush="{DynamicResource BorderBrush}"
@@ -11,6 +10,6 @@
     <hc:SimplePanel>
         <Path Margin="0,36,0,0" VerticalAlignment="Top" Width="70" Height="70" Data="{StaticResource LogoGeometry}" Fill="#f06632"/>
         <TextBlock Text="HandyControl" FontSize="30" Foreground="{StaticResource PrimaryBrush}" HorizontalAlignment="Center" Margin="0,122,0,0" VerticalAlignment="Top"/>
-        <Button Command="hc:ControlCommands.CloseWindow" CommandParameter="{Binding RelativeSource={RelativeSource Self}}" Content="{ex:Lang Key={x:Static hc:LangKeys.Close}}" HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Margin="10,0,10,10"/>
+        <Button Command="hc:ControlCommands.CloseWindow" CommandParameter="{Binding RelativeSource={RelativeSource Self}}" Content="{hc:Lang Key={x:Static hc:LangKeys.Close}}" HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Margin="10,0,10,10"/>
     </hc:SimplePanel>
 </Border>