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 conversion 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 - the model that shows the issue is `public/radio/radio.DAE`.  Load that into a three.js app, and you'll see that the battery on the back is oddly translated up from where it should be.
- You can see running properly with the fixes from this pull request [here](https://development.virtual.wf/radio) - I apologize for the cert error (we self-sign for our development server)