Change test logic to working version.

tests/Avalonia.Markup.Xaml.UnitTests/Xaml/BasicTests.cs

@@ -770,15 +770,8 @@ do we need it?")]
 <Window xmlns='https://github.com/avaloniaui'
                 xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
                 xmlns:local='clr-namespace:Avalonia.Markup.Xaml.UnitTests.Xaml;assembly=Avalonia.Markup.Xaml.UnitTests'>
-    <Window.Styles>
-        <Style Selector='local|InitializationOrderTracker'> 
-            <Style.Resources> 
-                 <x:Double x:Key='Double'>100</x:Double> 
-            </Style.Resources> 
-        </Style> 
-   </Window.Styles>     
-<local:InitializationOrderTracker Width='100' Height='{DynamicResource Double}'
-                     Tag='{Binding Height, RelativeSource={RelativeSource Self}}' />
+    <local:InitializationOrderTracker Width='100' Height='100'
+        Tag='{Binding Height, RelativeSource={RelativeSource Self}}' />
 </Window>";