try fix orb issues

Author: curtischong

torch_sim/models/orb.py

@@ -84,9 +84,10 @@ def cell_to_cellpar(
         else:
             angle = torch.tensor(90.0, device=cell.device, dtype=cell.dtype)
         angles.append(angle)
+    angles_tensor = torch.stack(angles)
     if radians:
-        angles = [angle * torch.pi / 180 for angle in angles]
-    return torch.concat((lengths, torch.stack(angles)))
+        angles_tensor = angles_tensor * torch.pi / 180.0
+    return torch.concat((lengths, angles_tensor))
 
 
 def state_to_atom_graphs(  # noqa: PLR0915