### Godot version

v4.0.beta17.mono.official [c40020513]

### System information

Windows 11 22H2

### Issue description

If a focused subwindow is destroyed, DisplayServerWindows may still attempt to send mouse motion events to that window, because `last_focused_window` isn't updated until another window is focused.

```
ERROR: Condition "!windows.has(p_window)" is true. Returning: Point2i()
   at: window_get_position (platform/windows/display_server_windows.cpp:999)
```

### Steps to reproduce

Run the MRP, click some non-Godot application window to focus it, then click the "CLOSE" button in the secondary window. This destroys the window without re-focusing the main window, so hovering the mouse over the main window will produce the error message above.

### Minimal reproduction project

[native_windows_hover.zip](https://github.com/godotengine/godot/files/10573386/native_windows_hover.zip)

SetCursorPos(pos.x, pos.y);
			SetCapture(wd.hWnd);
			_register_raw_input_devices(window_id);
		}
	} else {
		
		ReleaseCapture();
		ClipCursor(nullptr);
		_register_raw_input_devices(INVALID_WINDOW_ID);
	}
	if (p_mode == MOUSE_MODE_HIDDEN || p_mode == MOUSE_MODE_CAPTURED || p_mode == MOUSE_MODE_CONFINED_HIDDEN) {
		if (hCursor == nullptr) {
			hCursor = SetCursor(nullptr);
		} else {
			SetCursor(nullptr);
		}
	} else {
		CursorShape c = cursor_shape;
		cursor_shape = CURSOR_MAX;
		cursor_set_shape(c);
	}
}
DisplayServer::WindowID DisplayServerWindows::_get_focused_window_or_popup() const {
	const List<WindowID>::Element *E = popup_list.back();
	if (E) {
		return E->get();
	}
	return last_focused_window;
}
void DisplayServerWindows::_register_raw_input_devices(WindowID p_target_window) {