Updating the redirection of the webapp creation

The redirection of the webapp creation now redirects to the webapp
sandbox creation page instead of the user webapp list.

Signed-off-by: Matthieu Berjon <matthieu.berjon@inria.fr>
1 job for 207-goto-sandox-docker-creation-page-after-webapp-creation in 7 minutes and 13 seconds (queued for 6 minutes and 41 seconds)