make opt checkpoint dir name correct
Author: dumpmemory
Pull request: yes



# What does this PR do?
I found i can't load the converted checkpoint with tp_8 pp_1 dp_1 or tp_4 pp_2 dp_1, only tp 2 pp 2 dp 2 works. I check the code and found it might be the opt dir name issue. so i just fix it. and it works on my side. 
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Fixes # (issue)
https://github.com/huggingface/accelerate/issues/1088
#https://github.com/huggingface/accelerate/issues/1088

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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_21660). All of your documentation changes will be reflected on that endpoint.

cc @pacman100 

Friendly ping @pacman100 

@pacman100 ?

Hello, I will look into this tomorrow, thank you for your patience and sorry for the delay.