fix Molecule.get_boxed_structure when reorder=False (#4419)

Author: gpetretto

src/pymatgen/core/structure.py

@@ -3959,7 +3959,7 @@ def get_boxed_structure(
         return cls(
             lattice,
             self.species * nimages,
-            coords,
+            all_coords,
             coords_are_cartesian=True,
             site_properties=site_props,
             labels=self.labels * nimages,

tests/core/test_structure.py

@@ -2237,6 +2237,7 @@ def test_get_boxed_structure(self):
         no_reorder = self.mol.get_boxed_structure(10, 10, 10, reorder=False)
         assert str(s3[0].specie) == "H"
         assert str(no_reorder[0].specie) == "C"
+        assert_allclose(no_reorder[2].frac_coords, [0.60267191, 0.5, 0.4637])
 
     def test_get_distance(self):
         assert self.mol.get_distance(0, 1) == approx(1.089)