winhelp: Window style has not been initialized

[Kirill K. Smirnov]

This should fix bug #5503, but I haven't checked that

ChangeLog:
  Fix an uninitialized variable bug.

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diff --git a/programs/winhelp/hlpfile.c b/programs/winhelp/hlpfile.c
index 4d3c458..2e64270 100644
--- a/programs/winhelp/hlpfile.c
+++ b/programs/winhelp/hlpfile.c
@@ -1429,6 +1429,7 @@ static BOOL HLPFILE_SystemCommands(HLPFI
                 wi->size.cx = (flags & 0x0020) ? GET_USHORT(ptr, 80) : CW_USEDEFAULT;
                 wi->size.cy = (flags & 0x0040) ? GET_USHORT(ptr, 82) : CW_USEDEFAULT;
                 wi->style = (flags & 0x0080) ? GET_USHORT(ptr, 84) : SW_SHOW;
+                wi->win_style = WS_OVERLAPPEDWINDOW;
                 wi->sr_color = (flags & 0x0100) ? GET_UINT(ptr, 86) : 0xFFFFFF;
                 wi->nsr_color = (flags & 0x0200) ? GET_UINT(ptr, 90) : 0xFFFFFF;
                 WINE_TRACE("System-Window: flags=%c%c%c%c%c%c%c%c type=%s name=%s caption=%s (%d,%d)x(%d,%d)\n",