Replaced CheckButton with Switch on Budgie Settings

![screenshot from 2014-12-14 05 39 24](https://cloud.githubusercontent.com/assets/318095/5425666/bc0ce300-8353-11e4-8c2c-379a1c8315bd.png)
![screenshot from 2014-12-14 05 39 56](https://cloud.githubusercontent.com/assets/318095/5425667/bc505554-8353-11e4-9c48-f8f1381d8e7f.png)
![screenshot from 2014-12-14 05 40 03](https://cloud.githubusercontent.com/assets/318095/5425668/bc7c62e8-8353-11e4-865b-1c420766a560.png)