Modified dpad/button hitboxes for portrait overlays

Hopefully, this will mollify some of the complainers. Attached is an example of the changes (new hitboxes in blue, old ones in red/purple)
![changes](https://f.cloud.github.com/assets/2805586/1003463/0ee7963c-0a8e-11e3-9544-62c621074e4c.png)