Use shr_wv_sat_mod

[jedwards4b]

https://github.com/ESCOMP/CMEPS/blob/main/cesm/flux_atmocn/shr_flux_mod.F90#L273 should use
shr_wv_sat_mod.F90 for consistency with other components in calculation of qsat.

[jedwards4b]

Here is the modified code...
https://github.com/NCAR/cesm_dev/blob/b.e30_beta06.B1850C_LTso.ne30_t232_wgx3.192/SourceMods/src.drv/shr_flux_mod.F90

[jedwards4b]

From Rich Neale: Yes we should include these, to be more consistent and more accurate in the calculation.

[billsacks]

See also ESCOMP/CESM_share#21

A seemingly-important point from that issue:

The one caveat is that there's a factor of 0.98 applied to the humidity, which roughly adjusts for the ocean salinity. That factor needs to be kept, in the subroutines where it is present to begin with.