PySCF wrapper does not reset molecule when used as scanner #247

The current d3_energy, d3_grad and d3_hess wrappers do not patch the mean-field class to include the reset of the dispersion correction if the molecule changes, e.g. when used in an energy or gradient scanner.

Fix include a patch to the reset method to call with_dftd3.reset(mol) to ensure molecule objects stay consistent.

ping @CW-Huang