Fix DulzPlavchan mass generation

[CoreySpohn]

Describe the bug
The implementation of DulzPlavchan can generate massive planets (sometimes solar mass) because it tries to invert Forecaster and doesn't use the PlanetPhysicalModel.

To Reproduce
Steps to reproduce the behavior:
Generate masses with DulzPlavchanUniverse or DulzPlavchanUniverseEarthsOnly

Expected behavior
It should either invert through probabilistic sampling of the masses based on generated radii or generate the masses and then sample Forecaster for radius.

EXOSIMS version:

• master