Fixed sidebar footer for tour & venue listings

Sidebar footers for tours & venues were using $showdata['venue'] &
$showdata['tour'] for the title but those return full url's and break
the links and we only needed the text.
The artist footer already reflects that (as it is most widely used) so
no change there.
Merge pull request #1 from pixelnated/master

Updated the sidebar footers to correct broken rss links for Venues & Tours