[doc] ardumower simulator - link outdated

http://wiki.ardumower.de/index.php?title=Sensor_fusion#SLAM_simulation

Under chapter **SLAM simulation** the link 'The simulator code can be found in SVN' is not valid anymore.

> There was an error getting resource 'source':
401: Anonymous caller does not have storage.objects.get access to google-code-archive/v2/code.google.com/ardumower/project.json.
