### 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)
if (cres != res) {
			continue;
		}
		if (!dir_access->dir_exists(recentd[i])) {
			
			recentd.remove_at(i--);
			continue;
		}
		
		String name = recentd[i];
		if (res && name == "res://") {
			name = "/";
		} else {
			if (name.ends_with("/")) {
				name = name.substr(0, name.length() - 1);
			}
			name = name.get_file();
		}
		recentd_paths.append(recentd[i]);
		recentd_names.append(name);
	}
	EditorNode::disambiguate_filenames(recentd_paths, recentd_names);
	for (int i = 0; i < recentd_paths.size(); i++) {
		recent->add_item(recentd_names[i], theme_cache.folder);
		recent->set_item_metadata(-1, recentd_paths[i]);
		recent->set_item_icon_modulate(-1, theme_cache.folder_icon_color);
	}
	EditorSettings::get_singleton()->set_recent_dirs(recentd);
}
void EditorFileDialog::_recent_selected(int p_idx) {