Update Theme.xaml

Author: yanjinhuagood

src/WPFDevelopers.Net45x/Themes/Theme.xaml

@@ -713,7 +713,7 @@
 	<Style x:Key="WPFDevelopersWindow" BasedOn="{x:Null}" TargetType="{x:Type wd:Window}">
 		<Setter Property="Foreground" Value="{DynamicResource WD.RegularTextSolidColorBrush}" />
 		<Setter Property="Background" Value="{DynamicResource WD.BackgroundSolidColorBrush}" />
-		<Setter Property="BorderBrush" Value="{DynamicResource WD.WindowBorderBrushSolidColorBrush}" />
+		<Setter Property="BorderBrush" Value="{DynamicResource WD.PrimaryNormalSolidColorBrush}" />
 		<Setter Property="BorderThickness" Value="1" />
 		<Setter Property="IsTabStop" Value="False" />
 		<Setter Property="SnapsToDevicePixels" Value="True" />