wineX11drv: Correctly react to focus loses away from Wine. [try 2]

[Vitaliy Margolen]

Added check for LastError and return from SetForegroundWindow().

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  dlls/user32/tests/msg.c  |   10 ++++++++--
  dlls/winex11.drv/event.c |    4 ++--
  2 files changed, 10 insertions(+), 4 deletions(-)
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