### 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

--
_folder_dialog->popup_file_dialog();
}
void FindInFilesDialog::custom_action(const String &p_action) {
	for (int i = 0; i < _filters_container->get_child_count(); ++i) {
		CheckBox *cb = static_cast<CheckBox *>(_filters_container->get_child(i));
		_filters_preferences[cb->get_text()] = cb->is_pressed();
	}
	if (p_action == "find") {
		emit_signal(SNAME(SIGNAL_FIND_REQUESTED));
		hide();
	} else if (p_action == "replace") {
		emit_signal(SNAME(SIGNAL_REPLACE_REQUESTED));
		hide();
	}
}
void FindInFilesDialog::_on_search_text_modified(String text) {
	ERR_FAIL_COND(!_find_button);
	ERR_FAIL_COND(!_replace_button);
	_find_button->set_disabled(get_search_text().is_empty());
	_replace_button->set_disabled(get_search_text().is_empty());
}
void FindInFilesDialog::_on_search_text_submitted(String text) {