fixed a bug of window

src/Shared/HandyControlDemo_Shared/Window/BlurWindow.xaml

@@ -8,7 +8,6 @@
                      mc:Ignorable="d"
                      WindowStartupLocation="CenterScreen"
                      Title="{x:Static langs:Lang.Title}"
-                     ShowTitle="True"
                      Style="{StaticResource WindowBlur}"
                      Height="450" 
                      Width="800" 

src/Shared/HandyControlDemo_Shared/Window/CommonWindow.xaml

@@ -6,7 +6,6 @@
            xmlns:hc="https://handyorg.github.io/handycontrol"
            xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
            mc:Ignorable="d"
-           ShowTitle="True"
            Background="{DynamicResource MainContentBackgroundBrush}"
            WindowStartupLocation="CenterScreen"
            Style="{StaticResource WindowWin10}"

src/Shared/HandyControlDemo_Shared/Window/CustomNonClientAreaWindow.xaml

@@ -8,12 +8,12 @@
            mc:Ignorable="d"
            OtherButtonForeground="{DynamicResource ReverseTextBrush}"
            CloseButtonForeground="{DynamicResource ReverseTextBrush}"
-           OtherButtonHoverBackground="{DynamicResource ReverseTextBrush}"
            NonClientAreaBackground="{DynamicResource ToolBarBackground}"
            NonClientAreaHeight="69"
            Background="{DynamicResource MainContentBackgroundBrush}"
            WindowStartupLocation="CenterScreen"
            Style="{StaticResource WindowWin10}"
+           ShowTitle="False"
            Title="{x:Static langs:Lang.Title}" 
            Height="450" 
            Width="800">