### 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

--
_search_text_line_edit->set_text(text);
	_on_search_text_modified(text);
}
void FindInFilesDialog::set_replace_text(String text) {
	_replace_text_line_edit->set_text(text);
}
void FindInFilesDialog::set_find_in_files_mode(FindInFilesMode p_mode) {
	if (_mode == p_mode) {
		return;
	}
	_mode = p_mode;
	if (p_mode == SEARCH_MODE) {
		set_title(TTR("Find in Files"));
		_replace_label->hide();
		_replace_text_line_edit->hide();
	} else if (p_mode == REPLACE_MODE) {
		set_title(TTR("Replace in Files"));
		_replace_label->show();
		_replace_text_line_edit->show();
	}
	
	set_size(Size2(get_size().x, 0));
}
String FindInFilesDialog::get_search_text() const {