Ocean heat capacity is incorrect if conservative temperature is the prognostic ocean heat variable

[glwagner]

https://github.com/CliMA/CLIMAParameters.jl/blob/f779db6fa86f0bfce9de4ee31757fed1fe8b75ed/src/Planet/planet_parameters.jl#L37

This is not the correct value if conservative temperature is used as the prognostic variable that quantifies ocean heat content, which is the prognostic variable associated with the 2010 Thermodynamic Equation of Seawater:

https://www.nature.com/scitable/knowledge/library/key-physical-variables-in-the-ocean-temperature-102805293/

Equation 3.3.3 of the TEOS-10 manual prescribes a value of

conservative_temperature_heat_capacity = 3991.86795711963 # J / kg / K

The relevant section of the TEOS-10 manual is