shell32/tests: Fix a copy and paste error (PVS-Studio)

[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=10373

Your paranoid android.


=== wvistau64 (32 bit shlfileop) ===
shlfileop.c:815: Test failed: Expected ERROR_CANCELLED or DE_DIFFDIR

=== wvistau64 (64 bit shlfileop) ===
shlfileop.c:815: Test failed: Expected ERROR_CANCELLED or DE_DIFFDIR