Fix: no mixing_restart for scf_oscillate with sc and DFTU

Author: dyzheng

source/module_esolver/esolver_ks_pw.cpp

@@ -836,7 +836,7 @@ void ESolver_KS_PW<T, Device>::iter_finish(const int iter, const bool conv_elec)
         {
             sc.higher_mag_prec = 
                 this->p_chgmix->if_scf_oscillate(iter, this->drho, PARAM.inp.sc_os_ndim, PARAM.inp.scf_os_thr);
-            if(sc.higher_mag_prec)
+            if(sc.higher_mag_prec && !PARAM.inp.dft_plus_u)
             { // if oscillate, increase the precision of magnetization and do mixing_restart in next iteration
                 this->p_chgmix->mixing_restart_step = iter + 1;
             }