Update the calc units table

Update the calc units table

On 2018-11-16, the 26th meeting of the General Conference on Weights
and Measures (CGPM) has redefined the International System of Units by
adopting fixed values for the Planck constant, the elementary charge,
the Boltzmann constant, and the Avogadro constant:
https://www.bipm.org/utils/en/pdf/CGPM/Draft-Resolution-A-EN.pdf

* lisp/calc/calc-units.el (math-standard-units): Update according
to redefinition of the SI in 2018.  (Bug#33412)