Fix styling of editmodeswitcher for IE (9).

Before:

![bildschirmfoto 2013-05-15 um 11 21 41](https://f.cloud.github.com/assets/7469/506069/1ca413f8-bd41-11e2-97b9-8a97a7224ae3.png)

New:
![bildschirmfoto 2013-05-15 um 11 22 14](https://f.cloud.github.com/assets/7469/506071/2755f51e-bd41-11e2-86f3-bdd4e7dd8083.png)

/cc @maethu