### Godot version

4.1.1

### System information

linux

### Issue description

- When favoriting a path in a `FileDialog`, clicking on it travels to `path/to/dir/`.
- When going up a level from there, it doesn't go to `path/to` but to `path/to/dir` (without the `/`).

[simplescreenrecorder-2023-08-18_09.38.37.webm](https://github.com/godotengine/godot/assets/71937306/00c20ad3-292f-4961-84ed-dbc64906df52)

The problem is either (or both) that:
 - loaded path has a trailing `/`
 - parent dir of `stuff/` is considered to be `stuff`

### Steps to reproduce

favorite a directory and use the feature to navigate to it

### Minimal reproduction project

any (i.e. the project manager's "new project" dialog has one)
continue;
		}
		Dictionary item_meta = item_list->get_item_metadata(i);
		if (String(item_meta["path"]).begins_with(ProjectSettings::get_singleton()->get_project_data_path())) {
			allow_delete = false;
			break;
		}
	}
	if (single_item_selected) {
		item_menu->add_icon_item(theme_cache.action_copy, TTR("Copy Path"), ITEM_MENU_COPY_PATH);
	}
	if (allow_delete) {
		item_menu->add_icon_item(theme_cache.action_delete, TTR("Delete"), ITEM_MENU_DELETE, Key::KEY_DELETE);
	}
#if !defined(ANDROID_ENABLED) && !defined(WEB_ENABLED)
	
	if (single_item_selected) {
		item_menu->add_separator();
		Dictionary item_meta = item_list->get_item_metadata(p_item);
		String item_text = item_meta["dir"] ? TTR("Open in File Manager") : TTR("Show in File Manager");
		item_menu->add_icon_item(theme_cache.filesystem, item_text, ITEM_MENU_SHOW_IN_EXPLORER);
	}
#endif
	if (item_menu->get_item_count() > 0) {
		item_menu->set_position(item_list->get_screen_position() + p_pos);
		item_menu->reset_size();
		item_menu->popup();
	}
}
void EditorFileDialog::_item_list_empty_clicked(const Vector2 &p_pos, MouseButton p_mouse_button_index) {