[fix] check for MLD binary is redundant, remove it

def main(args):

    tool = args.tool

    if tool != "pyaudio3dtools" and shutil.which(tool) is None:

    # check for MLD will be done by the compare() function

    if tool == "CompAudio" and shutil.which(tool) is None:

        print(f"{tool} not in PATH - abort.")

        sys.exit(-1)