Removing the space for multiple appended and prepended input buttons

When multiple buttons are appended to an input in the .modal-footer the 5px left-margin should not apply.

Before:
![screen shot 2013-07-22 at 10 37 45 pm](https://f.cloud.github.com/assets/965298/840139/ac4c8e9c-f368-11e2-9b5b-44b130ceccf2.png)
![screen shot 2013-07-22 at 10 35 30 pm](https://f.cloud.github.com/assets/965298/840141/b246b28c-f368-11e2-9bd2-c98728b48887.png)
After: 
![screen shot 2013-07-22 at 10 37 28 pm](https://f.cloud.github.com/assets/965298/840144/c0387c18-f368-11e2-8b13-8a7201ffd998.png)

![screen shot 2013-07-22 at 10 36 34 pm](https://f.cloud.github.com/assets/965298/840142/b8306d1e-f368-11e2-9751-277c4040835c.png)