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7ffbc252 - Update train_controlnet_flux.py,Fix size mismatch issue in validation (#9679)

Update train_controlnet_flux.py,Fix size mismatch issue in validation (#9679) Update train_controlnet_flux.py Fix the problem of inconsistency between size of image and size of validation_image which causes np.stack to report error. Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>