Travel Commercial component search input: prevent rounded corners in iOS

### Before

![screen shot 2014-06-10 at 16 57 43](https://cloud.githubusercontent.com/assets/85783/3232901/23e39d5e-f0b8-11e3-9b3a-cfdd1b11c09f.PNG)


### After

![screen shot 2014-06-10 at 16 58 17](https://cloud.githubusercontent.com/assets/85783/3232893/1dee73d8-f0b8-11e3-8331-54b7c2aa299a.PNG)

![ ](http://media.giphy.com/media/GJi6ZBzgkWNmU/giphy.gif)