update gauge settings in TOV example to be more typical

The current gauge setting in the TOV example match what was used in the ET paper so that one produces the same plot. However that choice is somewhat unusual:

ML_BSSN::harmonicN           = 1      # these set:
ML_BSSN::harmonicF           = 1.0    # dot[alpha] = - alpha A
ML_BSSN::evolveA             = 1      # dot[A] = dot[trK]
ML_BSSN::evolveB             = 1      # these set: dot[beta] = dot[dot[beta]] = 0
ML_BSSN::ShiftGammaCoeff     = 0.0    # by choosing coeffs to zero the RHS
ML_BSSN::AlphaDriver         = 0.0
ML_BSSN::BetaDriver          = 0.0
ML_BSSN::advectLapse         = 0
ML_BSSN::advectShift         = 0

and it may make more sense to use settings that are closer to BNS setup so that they can be generalized eg:

ML_BSSN::harmonicN           = 1      # 1+log
ML_BSSN::harmonicF           = 2.0    # 1+log
ML_BSSN::ShiftGammaCoeff     = 0.75
ML_BSSN::AlphaDriver         = 0.0
ML_BSSN::BetaDriver          = 1.0
ML_BSSN::LapseAdvectionCoeff = 1.0
ML_BSSN::ShiftAdvectionCoeff = 1.0

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