Fix super tiny extra space typo
Author: fzyzcjy
Pull request: yes

# What does this PR do?

Hi thanks for the library! When using the Trainer (and TrainingArguments) I see an extra space. Thus this super very tiny PR :)

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Fixes # (issue)


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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Comments:
You are welcome!