change ucell in pwdft/forces.cpp

Author: A-006

source/module_hamilt_pw/hamilt_pwdft/forces.cpp

@@ -24,7 +24,7 @@
 #endif
 
 template <typename FPTYPE, typename Device>
-void Forces<FPTYPE, Device>::cal_force(const UnitCell& ucell,
+void Forces<FPTYPE, Device>::cal_force(UnitCell& ucell,
                                        ModuleBase::matrix& force,
                                        const elecstate::ElecState& elec,
                                        ModulePW::PW_Basis* rho_basis,

source/module_hamilt_pw/hamilt_pwdft/forces.h

@@ -33,7 +33,7 @@ class Forces
     Forces(const int nat_in) : nat(nat_in){};
     ~Forces(){};
 
-    void cal_force(const UnitCell& ucell,
+    void cal_force(UnitCell& ucell,
                    ModuleBase::matrix& force,
                    const elecstate::ElecState& elec,
                    ModulePW::PW_Basis* rho_basis,