Update ColladaLoader to convert single-axis translation animation data according to upConversion

In the latest version, the ColladaLoader properly converted the up direction for all animation keyframes except those that are a single-axis translation.  This fixes the up-direction converstion for those single-axis translations.

ColladaLoader examples still execute as before.

(Extra credit for those interested in seeing how the fix affects some models:

- Pull down the *development* branch of the Virtual World Framework here:  https://github.com/virtual-world-framework/vwf.git
- This will get you VWF and a bunch of example apps, including the *radio* which you can see running properly [here](https://development.virtual.wf/radio) - I apologize for the cert error (we self-sign for our development server)
- You can follow the *Core Developer Installation* instructions (choose your favorite, ruby or node.js) to run the VWF server locally and then replace the ColladaLoader.js file (in support\client\lib\vwf\model\threejs\js\loaders) with the latest in the three.js repository.  You will see that the radio battery is translated up from its intended position

Caveat: I didn't test those instructions step by step, so there might be an issue ... if so, let me know)

:smile: