Remove the manual inclusion of our resolution-independence plugin as this is already included in our custom LESS script.

### Issue
With the update in https://github.com/enyojs/enyo/pull/977, we are now including our resolution-independence plugin in our custom LESS script.

### Fix
We remove the manual inclusion of our resolution-independence plugin in `debug.html`. Additionally, we bump the `enyo` submodule so that we can use this new feature.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>