Not a very convenient option, but you can try manually deleting the downloaded configs. According to this website, you can find your downloaded control configuration files at <steam folder>/userdata/<your user number>/241100/remote/controller_config. On steam deck, you can usually find your steam folder by showing hidden files in the file browser (click the 3 bar menu in the upper right for this option), then go to the hidden .steam folder in your home folder, and then follow the steam folder shortcut there.
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