Non-blocking termination ends playback

[jaggzh]

I'm not sure how others didn't experience this issue -- perhaps something weird with threading.

    wave_out = output[0] if isinstance(output, tuple) else output
    if play: play_wave(wave_out, blocking=True, sr=tts.sr)
    if save_to is not None:
        save_wave(wave_out, save_to, sample_rate=tts.sr, 
                  bits_per_sample=bits_per_sample)

My output was terminating too soon during playback. Maybe others threads continue until it was done?

https://github.com/jaggzh/tts_arabic/blob/main/tts_arabic/models/core.py#L134

I can go ahead and do a PR for your review. I think I have the disabling of the download time test in there too though.