Remove seek handle

The circle that acts as seek handle is annoying and removing it allows you to be more precise when seeking.
![captura de pantalla 2014-03-13 a la s 12 23 42](https://f.cloud.github.com/assets/1706695/2408779/fcc4f634-aaa1-11e3-8895-d4c2d3cb2aea.png)