still have issues with pressure in 1-d momentum fluxes

[zingale]

It looks like we adding the pressure to the momntum flux in 1-d Cartesian in scale_flux(), but I think this is wrong -- it should already be added since mom_flux_has_p is always true for Cartesian. So I think that we need to remove this addition in advection_util.cpp

[zingale]

it looks like this was missed in #2468

[zhichen3]

I agree that the addition should be removed. #2468 makes mom_flux_has_p to return true instead of false for 1D cartesian, which is certainly the correct behavior. So now pressure is already included in the definition of flux in compute_flux_q