Fix the android banner sizes

Uses the actual banner dimensions. Note: Scaling past that *will* cause distortion since you'd be enlarging past the embedded banners' native dimensions.

Example:
![Imgur](http://i.imgur.com/9c7sweg.png)

If anyone has a better way without making a pixelated mess, feel free to share your idea.
Yes assigning both of them `scaleDensity` is intentional.