gdi32: Report correct HORZRES and VERTRES values for GetDeviceCaps() with DCs on a specific monitor.

Fix DLC Quest uses the primary monitor size to render when in fullscreen mode on non-primary monitors.
Signed-off-by: Zhiyi Zhang <zzhang@codeweavers.com>
Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>