Fix the authentication prompt appearing multiple times.
The recent change to reorganize how login works (9ab0cac0) actually

broke authentication a bit. RBTools would always prompt at least twice

for a password. This was due to the logic being incomplete and not

actually making use of the new parameters passed in.
This completes that change by adding those parameters instead of trying

for options.username and options.password.

Deleted my cookies and posted a change. Only had to enter my

login/password once, instead of twice.