fix bug

Author: haozhihan

source/module_hamilt_pw/hamilt_pwdft/operator_pw/velocity_pw.cpp

@@ -48,8 +48,8 @@ void Velocity::act
 ) const
 {
     ModuleBase::timer::tick("Operator", "Velocity");
-    const int npw = psi_in->get_ngk(this->ik);
-    // const int npw = psi_in->get_current_nbas();
+    // const int npw = psi_in->get_ngk(this->ik);
+    const int npw = psi_in->get_current_nbas();
     const int max_npw = psi_in->get_nbasis() / psi_in->npol;
     const int npol = psi_in->npol;
     const std::complex<double>* tmpsi_in = psi0;