psapi/tests: Don't check for exact value (try 7)

[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=16805

Your paranoid android.


=== w1064 (32 bit psapi_main) ===
psapi_main.c:157: Test failed: cbNeeded=136
psapi_main.c:644: Test failed: wrong length 3
No test summary line found

=== w1064 (64 bit psapi_main) ===
psapi_main.c:644: Test failed: wrong length 3
No test summary line found