[WDT] Toolbar mouseover shadow fix

Ok this is ridiculously minor, but it's one of those little things that winds me up on a daily basis so I fixed it.

When you mouseover a section on the WDT, the box-shadow is blurry on the right edge.

Before:
![shadow-old](https://f.cloud.github.com/assets/363540/49413/de3f5210-595b-11e2-825f-62542a892af7.png)

After:
![shadow-new](https://f.cloud.github.com/assets/363540/49414/e63a2436-595b-11e2-950f-b294a35e5e1e.png)