Remove Private Assets tag, so it builds and runs on Windows too.

CardsStarterKit/Core/Game/Blackjack.Core.csproj

@@ -14,9 +14,7 @@
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="MonoGame.Framework.DesktopGL" Version="3.8.*">
-      <PrivateAssets>All</PrivateAssets>
-    </PackageReference>
+    <PackageReference Include="MonoGame.Framework.DesktopGL" Version="3.8.*" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\Framework\Cards.Framework.csproj" />