Add copymode protection to class2 styles

src/CLASS2/angle_class2.cpp

@@ -41,6 +41,8 @@ AngleClass2::AngleClass2(LAMMPS *lmp) : Angle(lmp) {}
 
 AngleClass2::~AngleClass2()
 {
+  if (copymode) return;
+
   if (allocated) {
     memory->destroy(setflag);
     memory->destroy(setflag_a);

src/CLASS2/bond_class2.cpp

@@ -36,6 +36,8 @@ BondClass2::BondClass2(LAMMPS *lmp) : Bond(lmp) {}
 
 BondClass2::~BondClass2()
 {
+  if (copymode) return;
+
   if (allocated) {
     memory->destroy(setflag);
     memory->destroy(r0);

src/CLASS2/dihedral_class2.cpp

@@ -46,6 +46,8 @@ DihedralClass2::DihedralClass2(LAMMPS *lmp) : Dihedral(lmp)
 
 DihedralClass2::~DihedralClass2()
 {
+  if (copymode) return;
+
   if (allocated) {
     memory->destroy(setflag);
     memory->destroy(setflag_d);

src/CLASS2/improper_class2.cpp

@@ -45,6 +45,8 @@ ImproperClass2::ImproperClass2(LAMMPS *lmp) : Improper(lmp)
 
 ImproperClass2::~ImproperClass2()
 {
+  if (copymode) return;
+
   if (allocated) {
     memory->destroy(setflag);
     memory->destroy(setflag_i);