`current` is set to Window node after using OS window mode

**Describe the bug** Maybe related to #171. `current` variable of interactive shell is set to Window node when using OS window mode. When this problem happens, the correct `current` node will be unavailable until current scene is switched, reloaded or the game is restarted. (note) I inserted `print_debug` and found that `func _get_valid_root_nodes() -> Array` in [modules/variable_tracker/module.gd](https://github.com/Ark2000/PankuConsole/blob/69fdd0d39fc3e8b2125e7d0b25fa4d3e1765c6b7/addons/panku_console/modules/variable_tracker/module.gd) returned: `[@Window@36:<Window#172905991182>, Main:<Node3D#74255959313>, ...]` **To Reproduce** Steps to reproduce the behavior: 1. launch game 2. open PankuConsole 3. open any tools in OS window mode 4. `current` node is set to Window node **Expected behavior** `current` should be same as `current_scene` of game **Screenshots**   **Desktop (please complete the following information):** - OS: Windows 11 Pro - Version: 23H2 **Additional context**