comdlg32: tests: make sure no ANSI strings are passed to Unicode functions

[Mikołaj Zalewski]

  In these tests the OPENFILENAMEA is later sent to GetOpenFileNameW and 
GetSaveFileNameW. This patch clears the pointers to ANSI string before 
these calls, so that the structure can be treated as a valid 
OPENFILENAMEW and lstrlenW doesn't pass the end of the string.
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