Fix expected permissions on /home/amnesia: they're now 700.

Who knows *why* we didn't notice that this bug was actually verifying
buggy behaviour...
Set image to something that's actually in the pinentry window.

Some test suite update brought in a Seahorse picture, since back then,
we actually had the bug that made us use Seahorse, and did not notice.
Update test suite accordingly to the Windows XP -> Windows 8 migration.
One more test suite update for Windows 8.
One more test suite update for Windows 8.
One more test suite update for Windows 8.
One more test suite update for Windows 8.