urlmon/tests: Add a '\n' to an ok() call.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
http://testbot.winehq.org/JobDetails.pl?Key=9680

Your paranoid android.


=== WVISTAADM (32 bit url) ===
url.c:1535: Test failed: unexpected call OnProgress_SENDINGREQUEST