Remove redundant BaseAnimation._threading.
Remove redundant BaseAnimation._threading.

* It exactly duplicates the value of self._led.threadedAnim_.
* BaseAnimation has to know about self._led.threadedAnim_ - but it already did.
* Full solution later.

ManiacalLabs/BiblioPixel,rec/BiblioPixel,rec/BiblioPixel,ManiacalLabs/BiblioPixel,rec/BiblioPixel,rec/BiblioPixel,ManiacalLabs/BiblioPixel,ManiacalLabs/BiblioPixel