Fix names of non-GR parameters to be consistent with LAL
Currently the non-GR parameter names in likelihood.py are inconsistent with the expected values in LAL (and also internally inconsistent with the values in signal.py. This MR fixes this.
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Currently the non-GR parameter names in likelihood.py are inconsistent with the expected values in LAL (and also internally inconsistent with the values in signal.py. This MR fixes this.