urlmon/tests: Fix a typo in ok() message

[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
https://testbot.winehq.org/JobDetails.pl?Key=23302

Your paranoid android.


=== w1064 (32 bit misc) ===
misc.c:756: Test failed: [52] wrong mime: L"image/x-icon"

=== w1064 (64 bit misc) ===
misc.c:756: Test failed: [52] wrong mime: L"image/x-icon"