Remove overwritten get_redirect_url
Remove overwritten get_redirect_url

The contract model defines a get_absolute_url, which is where the user
should be redirected after attaching a new contract to a user.

rolandgeider/wger,wger-project/wger,wger-project/wger,DeveloperMal/wger,rolandgeider/wger,wger-project/wger,kjagoo/wger_stark,wger-project/wger,rolandgeider/wger,kjagoo/wger_stark,kjagoo/wger_stark,DeveloperMal/wger,rolandgeider/wger,petervanderdoes/wger,petervanderdoes/wger,DeveloperMal/wger,petervanderdoes/wger,petervanderdoes/wger,DeveloperMal/wger,kjagoo/wger_stark