### 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)
favorited_paths.append(favorited[i]);
			favorited_names.append(name);
		} else if (name.ends_with("/")) {
			if (name == current || name == current + "/") {
				current_favorite = favorited_paths.size();
			}
			name = name.substr(0, name.length() - 1);
			name = name.get_file();
			favorited_paths.append(favorited[i]);
			favorited_names.append(name);
		} else {
			
		}
	}
	if (fav_changed) {
		EditorSettings::get_singleton()->set_favorites(favorited);
	}
	EditorNode::disambiguate_filenames(favorited_paths, favorited_names);
	for (int i = 0; i < favorited_paths.size(); i++) {
		favorites->add_item(favorited_names[i], theme_cache.folder);
		favorites->set_item_metadata(-1, favorited_paths[i]);
		favorites->set_item_icon_modulate(-1, theme_cache.folder_icon_color);
		if (i == current_favorite) {
			favorite->set_pressed(true);
			favorites->set_current(favorites->get_item_count() - 1);
			recent->deselect_all();
		}
	}
}
void EditorFileDialog::_favorite_pressed() {