dotnetCorePackages.dotnet_{8,9,10}.aspnetcore: copy App package only

In dotnet 10, aspnetcore-runtime now includes dotnet-runtime as well.
Previously it only included the App package.  This allows the builder to
work with all versions.

pkgs/development/compilers/dotnet/packages.nix

@@ -227,7 +227,7 @@ let
       mkdir "$out"/bin
       ln -s "$out"/share/dotnet/dotnet "$out"/bin/dotnet
 
-      cp -Tr "$src/aspnetcore-runtime-${version}-${targetRid}" "$out"/share/dotnet
+      cp -Tr "$src/aspnetcore-runtime-${version}-${targetRid}"/shared/Microsoft.AspNetCore.App "$out"/share/dotnet/shared/Microsoft.AspNetCore.App
       chmod +w "$out"/share/dotnet/shared
 
       runHook postInstall