ntdll: Remove more path trailing chars.

[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
http://testbot.winehq.org/JobDetails.pl?Key=10288

Your paranoid android.


=== WNT4WSSP6 (32 bit file) ===
file.c:2261: Test failed: FindFirstFile on test-dir// should fail
file.c:2262: Test failed: FindFirstFile on test-dir</ should fail
file.c:2263: Test failed: FindFirstFile on test-dir>/ should fail
file.c:2264: Test failed: FindFirstFile on test-dir"/ should fail
file.c:2267: Test failed: FindFirstFile on test-dir\/ should fail
file.c:2275: Test failed: FindFirstFile on test-dir/ should fail
file.c:2277: Test failed: FindFirstFile on ./test-dir/ should fail