Add PrivateAssets to Processory library.

ShatterEffectSample/Processor/ShatterEffectSample.Processor.csproj

@@ -6,7 +6,7 @@
   </PropertyGroup>
   <!-- Let SDK include all .cs files by default -->
   <ItemGroup>
-    <PackageReference Include="MonoGame.Framework.DesktopGL" Version="3.8.*" />
-    <PackageReference Include="MonoGame.Framework.Content.Pipeline" Version="3.8.*" />
+    <PackageReference Include="MonoGame.Framework.DesktopGL" Version="3.8.*" PrivateAssets="all"/>
+    <PackageReference Include="MonoGame.Framework.Content.Pipeline" Version="3.8.*" PrivateAssets="all"/>
   </ItemGroup>
 </Project>