winex11.drv: translate the WM_DROPFILES point into client coordinates whenever possible

[Damjan Jovanovic]

Notepad++ ignores the return value of DragQueryPoint() which
determines whether the point is in client area coordinates or global
screen coordinates, and passes the returned point directly to
RealChildWindowFromPoint(), which means that on Windows the
WM_DROPFILES point must be in client coordinates. Translating the
point into client coodinates fixes dropping files into Notepad++ and
closes #28557.

Damjan Jovanovic
---
 dlls/winex11.drv/xdnd.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)
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