[theme-reviewers] Theme test data error

[Jon Cave]

The theme test data
(https://wpcom-themes.svn.automattic.com/demo/test-data.2011-01-17.xml)
has an error in it. Line 311 should have an opening <wp:postmeta> tag
on the line before. It's not a critical error, but it's not ideal
either.

I'm not sure who has access to update the theme test data, but I
thought I might as well start here :)

Cheers,
Jon