modules/sd_vae_approx.py: fix VAE-approx path

    global sd_vae_approx_model

    if sd_vae_approx_model is None:

        model_path = os.path.join(paths.models_path, "VAE-approx", "model.pt")

        sd_vae_approx_model = VAEApprox()

        sd_vae_approx_model.load_state_dict(torch.load(os.path.join(paths.models_path, "VAE-approx", "model.pt"), map_location='cpu' if devices.device.type != 'cuda' else None))

        if not os.path.exists(model_path):

            model_path = os.path.join(paths.script_path, "models", "VAE-approx", "model.pt")

        sd_vae_approx_model.load_state_dict(torch.load(model_path, map_location='cpu' if devices.device.type != 'cuda' else None))

        sd_vae_approx_model.eval()

        sd_vae_approx_model.to(devices.device, devices.dtype)