Fix lr-scaling store_true & default=True cli argument for textual_inversion training.

[aredden]

action="store_true" means that the default action will be to set the value to False, and then if provided, set the value to True. Currently the default is manually set as 'True', therefore no-matter-what it will be True.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[patrickvonplaten]

This looks good to me - @patil-suraj what do you think?

[patrickvonplaten]

Gently ping here @patil-suraj - could you maybe go into the PR and finish it otherwise?

[github-actions[bot]]

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[patrickvonplaten]

cc @williamberman @pcuenca could you maybe take over here? :-)

[patil-suraj]

Will merge this and update the readme in follow-up PR.