Foundry accepts productivity modules for concrete recipe

[kiku_the_nights_flwr]

Basically as the title says.

In the assembler one cannot add productivity modules as the concrete is not considered a intermediate product, yet in the foundry you can add further productivity modules. I would not consider this a bug if pipes/belts also got this treatment, but with those recipes you cannot add further productivity.

[Nemoricus]

As a related point, the foundry recipe for concrete is incorrectly placed in the intermediates tab, when all other concrete recipes are in the logistics tab.