[cragr/regions] Fixed navigation for connections with Cards and Loans

The loans details page was handled with AccountsPage instead of
LoansPage, so I placed 'accounts' after 'loans' to be sure that this
page is detected correctly. By security, I replaced the stay_or_go()
with go() before calling go_to_card().
Finally, since we don't handle transactions for Loans, I removed Loans
from the handled_types in iter_history().

Closes: 42251@sibi