Fixed the size of the hdpi wifi icon

I realized that the reason that the xxhdpi image was so small originally. The resolution was swapped with the hdpi icon and so that one is too large right now as can be seen in the screen shot.

![clean-status-bar-image](https://cloud.githubusercontent.com/assets/6266621/4534233/5019fd9e-4da3-11e4-93cd-ef7cf4fa4714.png)