Fixed xml tag

tests/Avalonia.Markup.Xaml.UnitTests/Avalonia.Markup.Xaml.UnitTests.csproj

@@ -17,7 +17,7 @@
     <ProjectReference Include="..\..\src\Avalonia.Controls\Avalonia.Controls.csproj" />
     <ProjectReference Include="..\..\src\Avalonia.Input\Avalonia.Input.csproj" />
     <ProjectReference Include="..\..\src\Avalonia.Interactivity\Avalonia.Interactivity.csproj" />
-    <ProjectReference Include="..\..\src\Avalonia.Layout\Avalonia.Layout.csproj">
+    <ProjectReference Include="..\..\src\Avalonia.Layout\Avalonia.Layout.csproj" />
     <ProjectReference Include="..\..\src\Avalonia.ReactiveUI\Avalonia.ReactiveUI.csproj" />
     <ProjectReference Include="..\..\src\Avalonia.Visuals\Avalonia.Visuals.csproj" />
     <ProjectReference Include="..\..\src\Avalonia.Styling\Avalonia.Styling.csproj" />