fixes StableDiffusionPipeline.from_single_file()not using proper config file when dropdown is None
fixes checkpoint switching issue.
use the same find_checkpoint_config() method from upstream repo. Pass the path from find_checkpoint_config() as local_config_file arg in StableDiffusionPipeline.from_single_file()
Description
StableDiffusionPipeline.from_single_file()not using proper config file when dropdown isNonefind_checkpoint_config()method from upstream repo. Pass the path fromfind_checkpoint_config()aslocal_config_filearg inStableDiffusionPipeline.from_single_file()