fix(render): Restore windowed fullscreen to prevent device loss

Exclusive fullscreen can remain in D3DERR_DEVICELOST for roughly 45
seconds after startup on Windows 11 with NVIDIA GPUs. During that time,
DX8Wrapper::End_Scene sleeps for 200 ms per frame and rendering drops to
about 5 FPS.

Restore the existing GeneralsOnline windowed-fullscreen path. It keeps the
fullscreen appearance while creating a windowed D3D device, which avoids
the lost-device state and remains stable at the configured frame rate.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 6fc47f85-1023-4457-9df0-8e97163e72f0

Author: sailro

GeneralsMD/Code/GameEngine/Include/GameNetwork/GeneralsOnline/NextGenMP_defines.h

@@ -121,7 +121,7 @@ static int FRAME_GROUPING_CAP = 64;
 
 #define GENERALS_ONLINE_IBRA_STARTING_POS_LOGIC 1
 
-//#define GENERALS_ONLINE_WINDOWED_FULLSCREEN 1
+#define GENERALS_ONLINE_WINDOWED_FULLSCREEN 1
 
 //#define GENERALS_ONLINE_USE_NEW_RNG_LOGIC 1
 //#define GENERALS_ONLINE_RNG_USE_PER_FRAME_VAL 1