Don't run nightly reports.

We haven't used the output of these in ages - teamcity does everything
better and more promptly - but they're still running every night causing
huge load.

Change-Id: Ia8df990be5b80bbd2f7447a7476dc745ea8b3e63
Reviewed-on: http://gerrit.dmdirc.com/3354
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>