Thumbs table text white on selection

In the table view of thumbnails in the center panel, the text of the selected item is white (shows better against the new blue selection background).

To test, check that text is white in table.

![screen shot 2013-05-22 at 11 36 56](https://f.cloud.github.com/assets/900055/547705/956e3dd8-c2cb-11e2-873e-ce36b78c0d4e.png)