On Windows 10 the DISPLAY_DEVICE_ACTIVE flag is set even if monitor is
in power
saving mode or switched off. Monitors without DISPLAY_DEVICE_ACTIVE are
only reported when display is disabled. This doesn't match with
CGDisplayIsActive function.

Current code causes rendering problems when native .NET is used. When
monitors are updated when in power saving mode (e.g. due to race on
machine wake-up) we might end up with no monitors being enumerated by
EnumDisplayMonitors.
Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>