[FSDP][optim_state_dict] Ignore the state check on rank that does not own the corresponding parameter (#93318)
When a rank does not own a parameter (parameter.numel() == 0), its optim state is not valid and should not be checked against the current saved one.
Differential Revision: [D42865237](https://our.internmc.facebook.com/intern/diff/D42865237/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/93318
Approved by: https://github.com/rohan-varma
