List user theme files.

def list_themes_user():
    """List user theme files."""
    themes = [*os.scandir(os.path.join(CONF_DIR, "colorschemes/dark/")),
              *os.scandir(os.path.join(CONF_DIR, "colorschemes/light/"))]
    return [t for t in themes if os.path.isfile(t.path)]