rework #10436 to use shared.walk_files

def process_batch(p, input_dir, output_dir, inpaint_mask_dir, args, to_scale=False, scale_by=1.0, use_png_info=False, png_info_props=None, png_info_dir=None):

def process_batch(p, input_dir, output_dir, inpaint_mask_dir, args, to_scale=False, scale_by=1.0, use_png_info=False, png_info_props=None, png_info_dir=None):

    processing.fix_seed(p)

    processing.fix_seed(p)

    images = []

    images = list(shared.walk_files(input_dir, allowed_extensions=(".png", ".jpg", ".jpeg", ".webp")))

    for root, directories, files in os.walk(input_dir):

        for filename in files:

            filepath = os.path.join(root, filename)

            if filepath.endswith(".jpg") or filepath.endswith(".jpeg") or filepath.endswith(".png") or filepath.endswith(".webp"):

                images.append(filepath)

    is_inpaint_batch = False

    is_inpaint_batch = False

    if inpaint_mask_dir:

    if inpaint_mask_dir: