Update pipeline_controlnet_inpaint_sd_xl.py

[detkov]

What does this PR do?

Updates controlnet typing in __init__ method of StableDiffusionXLControlNetInpaintPipeline class. Allows correct usage of from_pipe when using multiple ControlNetModel in the pipeline one wants to reuse.

Fixes #7982

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@yiyixuxu

[yiyixuxu]

thank you!

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