spot_params_bb_pm exporting the old way

[Cristiano-Maggi]

The parameterized photometric billboards are being exporting with the OLD dx dy dz width scheme by io_xplane2blender_4_2_0-rc_2-117_20220419015723-v12. "spot_params_sp_pm" and "spot_params_bb_pm" in the same position should have matching values but they don't. Example: LIGHT_PARAM spot_params_sp_pm 24.988914 23.926901 80.047714 1 0.82278591 0.52711523 1 15000cd -0.32809913 -0.28239337 -0.90144604 0.64278761 LIGHT_PARAM spot_params_bb_pm 24.988914 23.926901 80.047714 1 0.82278591 0.52711523 15000cd -0.91849875 -0.79054749 -2.5235577 -1.7994549