[Windows] Fix setting initial non-exclusive window mode.

(cherry picked from commit db0109b23713cc9ebdb6f8efb1097874fda81113)

platform/windows/display_server_windows.cpp

@@ -3926,7 +3926,9 @@ DisplayServer::WindowID DisplayServerWindows::_create_window(WindowMode p_mode,
 	WindowRect.top += offset.y;
 	WindowRect.bottom += offset.y;
 
-	AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle);
+	if (p_mode != WINDOW_MODE_FULLSCREEN && p_mode != WINDOW_MODE_EXCLUSIVE_FULLSCREEN) {
+		AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle);
+	}
 
 	WindowID id = window_id_counter;
 	{

scene/main/window.cpp

@@ -2653,7 +2653,7 @@ void Window::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("popup_exclusive_centered_clamped", "from_node", "minsize", "fallback_ratio"), &Window::popup_exclusive_centered_clamped, DEFVAL(Size2i()), DEFVAL(0.75));
 
 	// Keep the enum values in sync with the `Mode` enum.
-	ADD_PROPERTY(PropertyInfo(Variant::INT, "mode", PROPERTY_HINT_ENUM, "Windowed,Minimized,Maximized,Fullscreen"), "set_mode", "get_mode");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "mode", PROPERTY_HINT_ENUM, "Windowed,Minimized,Maximized,Fullscreen,Exclusive Fullscreen"), "set_mode", "get_mode");
 
 	ADD_PROPERTY(PropertyInfo(Variant::STRING, "title"), "set_title", "get_title");