Fix bug when deserialising cell object.
Fix bug when deserialising cell object.

Before cell.pseudo would be overwritten by cell.ecp.

sunqm/pyscf,gkc1000/pyscf,gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf