Fixed sidebar footer for iCal links

Forgot to include the title tag changes for the iCal links as we did
for the RSS link fix. (SORRY!)
Updated where we were getting $showdata['tour'] and $showdata['venue']
for the title tags to reflect the '%_plain' versions as we only want the
title text and not a URL.
Merge pull request #2 from pixelnated/master

Forgot to include the fix for the iCal link which is the same as the RSS links.