Fixes table styling in CKEditor div mode

Before:
![bildschirmfoto 2013-07-26 um 21 33 33](https://f.cloud.github.com/assets/1836347/864853/f06a7ae8-f62a-11e2-8cc3-38971c40a85a.png)

After:
![bildschirmfoto 2013-07-26 um 21 32 56](https://f.cloud.github.com/assets/1836347/864855/f475d43e-f62a-11e2-9aa7-f425101a9e94.png)