simulateHeterodynedCW.py: remove explicit ephem name check
Description
In the HeterodynedCWSimulator
it sets the solar system ephemeris type, e.g., DE200 or DE405. Currently, when this gets set it checks whether the value is one of 4 values. This hardcoding can be problematic if you want to use a different ephemeris. This MR removes that check. There are still checks that will catch if an ephemeris file doesn't exist.
API Changes and Justification
Backwards Compatible Changes
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This change introduces no API changes -
This change adds new API calls
Backwards Incompatible Changes
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This change modifies an existing API -
This change removes an existing API
If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.