Remove duplicate parameters in run_clip.py
Author: nursery42
Pull request: yes

# What does this PR do?
The overwrite_cache parameter in this file is declared twice. Remove one of the two. 
https://github.com/huggingface/transformers/blob/main/examples/pytorch/contrastive-image-text/run_clip.py
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Comments:
_The documentation is not available anymore as the PR was closed or merged._