winex11.drv: Send WM_DROPFILES if IDropTarget_Drop failed

[Piotr Caban]

This partially fixes following regression:
https://bugs.winehq.org/show_bug.cgi?id=39445
unfortunately there's another regression caused by 
3f99e71fde8231524597901e512e5c1909a82e1e commit in this application.

Signed-off-by: Piotr Caban <piotr at codeweavers.com>
---
  dlls/winex11.drv/xdnd.c | 7 ++++---
  1 file changed, 4 insertions(+), 3 deletions(-)


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