hlink/tests: Use wine_dbgstr_guid() to print a REFIID.

[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=24381

Your paranoid android.


=== w1064 (32 bit hlink) ===
hlink.c:414: Test failed: url only: Saved data differs
hlink.c:414: Test failed: url + friendly name: Saved data differs
hlink.c:414: Test failed: url + friendly_name + location: Saved data differs
hlink.c:414: Test failed: url + target frame name: Saved data differs

=== w1064 (64 bit hlink) ===
hlink.c:414: Test failed: url only: Saved data differs
hlink.c:414: Test failed: url + friendly name: Saved data differs
hlink.c:414: Test failed: url + friendly_name + location: Saved data differs
hlink.c:414: Test failed: url + target frame name: Saved data differs