cubicweb #2423575 lost login redirection [validation pending]

if I access extranet?vid=allactivepatches for instance, I ends up on the login form. Filling it, click ok, ends up on the index page instead of the originaly requested page

done in3.15.2
load left0.000
closed by#8de41063d629 [web login] fix after login redirection: redirect expect an url not a relative path. Breaks on cases like '?vid=aview'. Closes #2423575