### 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

--
return _search_text_line_edit->get_text();
}
String FindInFilesDialog::get_replace_text() const {
	return _replace_text_line_edit->get_text();
}
bool FindInFilesDialog::is_match_case() const {
	return _match_case_checkbox->is_pressed();
}
bool FindInFilesDialog::is_whole_words() const {
	return _whole_words_checkbox->is_pressed();
}
String FindInFilesDialog::get_folder() const {
	String text = _folder_line_edit->get_text();
	return text.strip_edges();
}
HashSet<String> FindInFilesDialog::get_filter() const {
	
	HashSet<String> filters;
	for (int i = 0; i < _filters_container->get_child_count(); ++i) {
		CheckBox *cb = static_cast<CheckBox *>(_filters_container->get_child(i));
		if (cb->is_pressed()) {
			filters.insert(cb->get_text());
		}
	}
	return filters;
}
void FindInFilesDialog::_notification(int p_what) {