wininet: Use passive mode for the ftp tests.

[Hans Leidekker]

Active mode ftp requires the server to open a connection back to the client
for data transfers, which is usually blocked by firewalls. Switching to passive
fixes the hanging test for me but it exposes 23 test failures, so there's
more work to do here.

I also observed occasional crashes like the one Alexandre reported earlier.
They appear to coincide with this message (from a wireshark trace):

 Response: 530 Sorry, the maximum number of allowed clients (10) are already connected.

Let's increase that number a bit, say to the number of Wineconf participants
we expect to see next year...

 -Hans
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