update test to include new `color-base` dependency

`color-base` used to be included in `dom-style` as a javascript file
called `color.js` and was subsequently refactored into a YUI module.

https://github.com/yui/yui3/commit/d2245af3e429dc45ec65164500d5e84dd285d66c#src/dom/js/color-deprecated.js
https://github.com/yui/yui3/commit/f6e0bd643326fb360496bab29a4a50ca622f30b0
Merge pull request #800 from ekashida/fix-loader-tests

update test to include new `color-base` dependency