[2/2] shell32/tests: Check if error status is reset after successful file copy

[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=15616

Your paranoid android.


=== w2000pro (32 bit shlfileop) ===
shlfileop.c:1833: Test failed: Expected ERROR_SUCCESS, got 6

=== wvistau64 (32 bit shlfileop) ===
shlfileop.c:818: Test failed: Expected ERROR_CANCELLED or DE_DIFFDIR

=== wvistau64 (64 bit shlfileop) ===
shlfileop.c:818: Test failed: Expected ERROR_CANCELLED or DE_DIFFDIR