### Godot version

4.0

### System information

Windows 11

### Issue description

So on my monitor with 2560x1440 resolution retrieved by the `DisplayServer.get_window_size` method shows 2562x1442, which I think is incorrect. A similar result returned by `get_viewport().size`. But it's become correct if the `Resizable` property is turned on.

![image](https://user-images.githubusercontent.com/3036176/212492776-5c09b12e-d25a-4951-8392-54f5a5e3bece.png)


### Steps to reproduce

Create the project, add a label to observe the resolution text, set the full-screen mode in the project settings, toggle off the `Resizable` property, and run the project.

### Minimal reproduction project

[TestResolution.zip](https://github.com/godotengine/godot/files/10418682/TestResolution.zip)

}
		wd.was_maximized = wd.maximized;
		if (wd.pre_fs_valid) {
			GetWindowRect(wd.hWnd, &wd.pre_fs_rect);
		}
		int cs = window_get_current_screen(p_window);
		Point2 pos = screen_get_position(cs) + _get_screens_origin();
		Size2 size = screen_get_size(cs);
		wd.fullscreen = true;
		wd.maximized = false;
		wd.minimized = false;
		_update_window_style(p_window, false);
		MoveWindow(wd.hWnd, pos.x, pos.y, size.width, size.height, TRUE);
		
		
		SystemParametersInfoA(SPI_GETMOUSETRAILS, 0, &restore_mouse_trails, 0);
		if (restore_mouse_trails > 1) {
			SystemParametersInfoA(SPI_SETMOUSETRAILS, 0, 0, 0);
		}
	}
	
	if (mouse_mode == MOUSE_MODE_CONFINED || mouse_mode == MOUSE_MODE_CONFINED_HIDDEN) {
		RECT crect;
		GetClientRect(wd.hWnd, &crect);
		ClientToScreen(wd.hWnd, (POINT *)&crect.left);
		ClientToScreen(wd.hWnd, (POINT *)&crect.right);
		ClipCursor(&crect);
	}
}
DisplayServer::WindowMode DisplayServerWindows::window_get_mode(WindowID p_window) const {