fix the command of inpainting

[arthur-qiu]

No description provided.

[innerlee]

Thank you!

[OpenMMLab-Assistant-007]

Hi!
@arthur-qiu
First of all, we want to express our gratitude for your significant PR in the OpenMMLab project. Your contribution is highly appreciated, and we are grateful for your efforts in helping improve this open-source project during your personal time. We believe that many developers will benefit from your PR.

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Thank you again for your contribution❤