shell32/tests: Skip SHFileOperationW tests if the user doesn't have admin rights.

[Hans Leidekker]

On Mon, 2016-12-19 at 04:54 -0600, Marvin wrote:
> 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=27406
> 
> Your paranoid android.
> 
> 
> === wvistau64 (32 bit shlfileop) ===
> shlfileop.c:818: Test failed: Expected ERROR_CANCELLED or DE_DIFFDIR, got 128
> 
> === wvistau64 (64 bit shlfileop) ===
> shlfileop.c:818: Test failed: Expected ERROR_CANCELLED or DE_DIFFDIR, got 128

This test also fails with a whitespace patch:
https://testbot.winehq.org/JobDetails.pl?Key=27409