Remove extra box shadow from Edit/Undo buttons on Upload/Edit package

Was:
![image](https://cloud.githubusercontent.com/assets/7574/3134596/bb1f33d4-e827-11e3-9a12-767b6ac6ab43.png)

Now:
![image](https://cloud.githubusercontent.com/assets/7574/3134592/acfb46a8-e827-11e3-821f-cc9c4967a822.png)