### Godot version

4.x

### System information

Windows 10

### Issue description

The `Search Result` panel is not correctly updated when changing the theme.

https://user-images.githubusercontent.com/66004280/208964493-d0423b78-3418-44c9-95ed-822fd34c4720.mp4



### Steps to reproduce

1. Search something
2. Change the theme

### Minimal reproduction project

--
_finder->stop();
	_status_label->set_text("");
	update_replace_buttons();
	set_progress_visible(false);
	_refresh_button->show();
	_cancel_button->hide();
}
void FindInFilesPanel::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_PROCESS: {
			_progress_bar->set_as_ratio(_finder->get_progress());
		} break;
		case NOTIFICATION_THEME_CHANGED: {
			_search_text_label->add_theme_font_override("font", get_theme_font(SNAME("source"), SNAME("EditorFonts")));
			_results_display->add_theme_font_override("font", get_theme_font(SNAME("source"), SNAME("EditorFonts")));
		} break;
	}
}
void FindInFilesPanel::_on_result_found(String fpath, int line_number, int begin, int end, String text) {
	TreeItem *file_item;
	HashMap<String, TreeItem *>::Iterator E = _file_items.find(fpath);
	if (!E) {
		file_item = _results_display->create_item();
		file_item->set_text(0, fpath);
		file_item->set_metadata(0, fpath);
		
		
		
		file_item->set_expand_right(0, true);
		_file_items[fpath] = file_item;