Rebuilds the call to the imported news item so that the URL comes from the news blog, rather than the Chomsky site. This is necessary because switch_to_blog() has some bugs that aren't worked out yet, as referenced in https://wordpress.org/support/topic/post-thumbnails-for-another-site-appearing-wrong-after-switch_to_blog . This should resolve #5.

Signed-off-by: Matt Bernhardt <mjbernha@mit.edu>