Fix gmflow_dir

[pravdomil]

What does this PR do?

users cannot change gmflow_dir
since every time
custom pipeline gets downloaded
and overrides user changes
this fixes that

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Who can review?

@SingleZombie

[HuggingFaceDocBuilderDev]

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[pravdomil]

...

[yiyixuxu]

oh thanks!

[yiyixuxu]

can you resolve the conflicts and fix the quality test?

[pravdomil]

yes after others PR gets merged

[yiyixuxu]

what other PRs?

[pravdomil]

https://github.com/huggingface/diffusers/pulls/pravdomil

[pravdomil]

ready