Removed left border for tl-tl-mpu slice on tablet

Just small thing I noticed on tablet version:

Before:
![screen shot 2014-10-02 at 11 46 24](https://cloud.githubusercontent.com/assets/2579465/4492875/d8d0d73c-4a44-11e4-9201-fe49cf02b485.png)

After:
![screen shot 2014-10-02 at 16 00 58](https://cloud.githubusercontent.com/assets/2579465/4492883/eecddd0a-4a44-11e4-9d26-4b0cfc2b18ca.png)