Update MainWindow.xaml (#2961)

Update windows height for better compatibility with HD screens (1280x720 or 1366x768)

Author: gudarzi

MainDemo.Wpf/MainWindow.xaml

@@ -8,7 +8,7 @@
         xmlns:system="clr-namespace:System;assembly=mscorlib"
         Title="Material Design in XAML"
         Width="1100"
-        Height="800"
+        MaxHeight="{Binding Source={x:Static SystemParameters.MaximizedPrimaryScreenHeight}}"
         d:DataContext="{d:DesignInstance domain:MainWindowViewModel}"
         AutomationProperties.Name="{Binding Title, RelativeSource={RelativeSource Self}}"
         Icon="favicon.ico"