Fix updating ASHP Inputs defaults from REopt.jl

[Bill-Becker]

• There were extra input fields coming back from REopt.jl for ASHP defaults (fields that were not included in the API, such as can_serve_process_heat) and trying to update the Django models for ASHP Inputs with those, and that was causing the update to error silently (within a try except clause)
• This PR prunes any of those extra fields that are not included in the Django model classes before updating the models