Check if we should skip dynamic layout params when generating air public inputs

[fmoletta]

Looking at the cairo_lang code, when the public inputs are generated (reference) the layout params are set to None by default even if the layout is dynamic. If we run a program using a dynamic layout and output the public inputs using cairo-lang we can see that the dynamic_params field is null. In cairo-vm we write the layout params when the layout is dynamic.