fix file modes and default to posix path prints for diff-compat

def get_hash_line_for_file(file: Path, experiment_dir: Path):

    with open(file, "b") as f:

    with open(file, "rb") as f:

        hash = md5(f.read()).hexdigest()

    filepath = file.relative_to(experiment_dir)

    hashline = f"{str(filepath)} {hash}"

    # always print forward slashes even on windows to be able to diff the result files

    hashline = f"{str(filepath.as_posix())} {hash}\n"

    return hashline

    hashlines = [get_hash_line_for_file(f, experiment_dir) for f in wav_files]

    with open(out_file) as f:

    with open(out_file, "w") as f:

        f.writelines(hashlines)