shlwapi/tests: fixed the wide-character tests when built on gcc compilers.

[Reece Dunn]

The SHCreateStreamOnFile tests were built using msvc, not mingw/gcc.
Therefore, the WCHAR string arrays were not explicitly null
terminated.

This patch explicitly adds a null-terminator so that compilers that
don't null-terminate the array produce a string array that is properly
null-terminated. This is a partial split out of one of my previous
patches submitted to fix the tests on Wine.

- Reece
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