All drivers support UpdateDisplayDevices now, so we can avoid a server
call by being explicit in the null driver.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52180Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>