bug when saveobj

[Leestronger]

PyMAF-X-smplx/apps/demo_smplx.py"，ine 453，in run_demomesh_folder = os.path.join(output_path, 'meshes', f'lperson_id:04d}')TypeError: unsupported format string passed to tuple.-format-

When using save_obj, the code should be a continuation of code that uses pymaf, but pymaf doesn't support multiple people, but pymafx does, so person_id is not a number, but a tuple that needs to be changed. Also, during the modification process, I discovered that due to img_arm, if the grid file is the same when rendered, the grid obtained by img_full will be overwritten when img_arm is rendered.