Declined Credit card redirects user to wrong page.

When using Authorize.net (haven't tested with other payment handlers), if a card is declined after hitting the "Make Contribution" button on the Confirmation page, the user is sent to civicrm/contribute/civicrm/contribute/transact

Steps to Reproduce:

1. Log in as an administrative user
2. Make sure you have a live Authorize.net account or some way to make a test account produce (Payment Processor Error message: 1: 2 This transaction has been declined, I believe it's a $2 transaction)
3. Create a membership
4. Create a contribution page that links to this membership
5. Set this payment processor to be used by the created contribution page.
6. Allow a Confirmation Page on for this contribution page
7. Navigate to the Contribution Live Page
8. If you are using a live auth.net account you can use the credit care 4111111111111111 and it will make it fail.
9. Click Make Contribution
10. On the confirmation page click "Make Contribution"

http://screencast.com/t/kXhn9ANVi

Expected results,

Be sent back to the Payment information entry page at the start of the contribution with an error explaining why you were sent back there.