winhlp32: Ensure Open dialog is modal

[Owen Rudge]

When selecting the Open option in winhlp32, the window would not have an 
owner, and as such would not be modal. This patch passes the active 
window's hWnd to GetOpenFileName, partially fixing bug 19081.

---
  programs/winhlp32/winhelp.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)

-- 
Owen Rudge
http://www.owenrudge.net/
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