Messed up URL when redirecting to auth during login or refresh

[ralflang]

@Schlue

Sometimes I get a messed up url especially when logging into imp to
authenticate the imap server:
http://192.168.1.100/horde/login.php?url%5Banchor%5D=&url%5Bparameters%5D%5B_t%5D=87234687&url%5Bparameters%5D%5B_h%5D=234-kj45jhg2435jhg&url%5Braw%5D=1&url%5Burl%5D=http%3A%2F%2F192.168.1.100%2Fimp%2F&app=imp

It also happens for me when the max_time of a session has reached and you
get logged out. Then a redirect happen to the login page and there the
url parameter is "messed" up. Looks like the url was stored in an array
of an array but after adding a lot of debug code I'm still not able to
find/see the problem :-(