comdlg32/tests: Fix test on Win7

[Ge van Geldorp]

On Win7 GetOpenFileNameA() changes the current directory.

Changelog:
  comdlg32/tests: Fix test on Win7

---
 dlls/comdlg32/tests/filedlg.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)



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