[ticket/233] Properly redirect to portal after login

We need to provide a proper path with controller helper and path helper.
A simple path to the portal is not enough, as we redirect from ucp.php.
Therefore, we need to remove the web root path from the URL to the portal.

B3P-233
Merge pull request #234 from marc1706/ticket/233

[ticket/233] Properly redirect to portal after login