### Godot version

v4.2.dev3.official [013e8e3af]

### System information

Godot v4.2.dev3 - macOS 13.4.1 - Vulkan (Forward+) - integrated Apple M1 - Apple M1 (8 Threads)

### Issue description

The content is empty. In the list `<Select Importer> `should be preselected, if possible. 
Or directly show the settings for "Animation Library" (check first selection).


![Bildschirmfoto 2023-08-22 um 01 29 44](https://github.com/godotengine/godot/assets/41921395/8300a756-ff54-4310-a0ad-04ad9525aeb9)


### Steps to reproduce

1. Project
2. Project Settings
3. Import Defaults 

https://github.com/godotengine/godot/assets/41921395/cb263c7d-27f0-4053-a555-0ed03ac7ef2a



### Minimal reproduction project

N/A
HBoxContainer *hb = memnew(HBoxContainer);
	hb->add_child(memnew(Label(TTR("Importer:"))));
	importers = memnew(OptionButton);
	hb->add_child(importers);
	hb->add_spacer();
	importers->connect("item_selected", callable_mp(this, &ImportDefaultsEditor::_importer_selected));
	reset_defaults = memnew(Button);
	reset_defaults->set_text(TTR("Reset to Defaults"));
	reset_defaults->set_disabled(true);
	reset_defaults->connect("pressed", callable_mp(this, &ImportDefaultsEditor::_reset));
	hb->add_child(reset_defaults);
	add_child(hb);
	inspector = memnew(EditorInspector);
	add_child(inspector);
	inspector->set_v_size_flags(SIZE_EXPAND_FILL);
	
	
	inspector->set_use_doc_hints(true);
	CenterContainer *cc = memnew(CenterContainer);
	save_defaults = memnew(Button);
	save_defaults->set_text(TTR("Save"));
	save_defaults->connect("pressed", callable_mp(this, &ImportDefaultsEditor::_save));
	cc->add_child(save_defaults);
	add_child(cc);
	settings = memnew(ImportDefaultsEditorSettings);
}
ImportDefaultsEditor::~ImportDefaultsEditor() {
	memdelete(settings);
}