Fixed scrolling in keybinding window

You're tired of excessive empty lines? The scrollbar in keybinding screen fools you all time? It's time to stop it!

WAS:
![scroll](https://cloud.githubusercontent.com/assets/5421954/4279880/d7281b24-3d25-11e4-8d46-02973523294d.png)


IS:
![fixed](https://cloud.githubusercontent.com/assets/5421954/4279882/dbc9aeb8-3d25-11e4-9d69-ca128ef70b93.png)



*Merge this PR now and get a few crashes for free!*