Moved text view filter entry to filter box.

A small cosmetic change for cylc-6: move the text view task name filter entry into the task state filter box. IMO this is where it should be - all task filtering controls in one place, and more obvious.

![filter-box-moved](https://cloud.githubusercontent.com/assets/2362137/4184733/e1133c46-374d-11e4-9772-c175620db649.png)

@benfitzpatrick - please review.