attr_map potentially needs to be updated

https://github.com/NREL/HOPP/blob/0b3aee3737198575e905c45f6ef56756173d2d0d/hopp/simulation/hybrid_simulation.py#L1188

I believe at the line above that the attribute `om_expenses` doesn't exist any more but has been updated to `om_total_expenses`. Need to confirm this, and if confirmed, need to update the `attr_map`.