advapi32: Fix wine_debugstr_wn to not read past the end of the buffer.

[Hans Leidekker]

I agree with Dan, the version of wine_debugstr_wn in the test reads
one WCHAR past the end of the buffer when the specified length includes
terminating zero. Changing it to read like the original in libs/wine/debug.c
makes Valgrind happy again.

 -Hans

Changelog
 Fix wine_debugstr_wn to not read past the end of the buffer.
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