[Sim_market] Only viable fields in get_configurable_fields

[NikkelM]

As mentioned in #485, the linear and circular economies need different parameters in the config files. The current implementation contains all possible parameters for both. This should be changed to include only the valid parameters.
Make sure to add a new config file in the default_configuration-folder for this new distinction, and name them accordingly (some renaming might be necessary for places where the market-config is being loaded)