Stop copying moment_kinetics_input.jl?

[mrhardman]

Now that the inputs are all (?) passed through checked namelists using set_defaults_and_check_section!(), would it be possible to stop copying the moment_kinetics_input.jl file to the run directory? moment_kinetics_input.jl should now be as static as any other part of the source.

[johnomotani]

I agree there's no need to copy moment_kinetics_input.jl now. Would be more useful to copy the TOML input file (although its contents should be captured in the .h5 output files).