Disable edit-bar for the advanced search form.

Before:
![bildschirmfoto 2014-07-22 um 17 28 24](https://cloud.githubusercontent.com/assets/485755/3660186/0f10ba88-11b5-11e4-8d21-89c1cd2b988d.png)
After: 
![bildschirmfoto 2014-07-22 um 17 32 42](https://cloud.githubusercontent.com/assets/485755/3660232/725c81bc-11b5-11e4-9fae-2eeff2a4c045.png)

@lukasgraf please take a look.