Nutupane: fix alignment of details panel to table header.

Before:
![before](https://f.cloud.github.com/assets/4116405/863504/c622fa96-f60a-11e2-8d42-705e66908e70.png)

Notice the right side of the 

After:
![after](https://f.cloud.github.com/assets/4116405/863508/cdbaef84-f60a-11e2-857b-2829759e208a.png)