Added 'zone-uk' back into zones css to defend against old content

Some old tag content still have zone of 'uk' not 'uk-news' therefore we need to defend against this in the css to prevent styling issues.

### Before
![Before](http://cl.ly/image/3G0P0N2t1q33/before.jpg)

### After
![After](http://cl.ly/image/0v1Z1H0k0G3s/after.jpg)