Fix bug in davidson eig solver when initial guess is a converged excited state
Fix bug in davidson eig solver when initial guess is a converged excited state

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