### 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

--
prefix_label->set_text("res://");
		hbc->add_child(prefix_label);
		_folder_line_edit = memnew(LineEdit);
		_folder_line_edit->set_h_size_flags(Control::SIZE_EXPAND_FILL);
		hbc->add_child(_folder_line_edit);
		Button *folder_button = memnew(Button);
		folder_button->set_text("...");
		folder_button->connect("pressed", callable_mp(this, &FindInFilesDialog::_on_folder_button_pressed));
		hbc->add_child(folder_button);
		_folder_dialog = memnew(FileDialog);
		_folder_dialog->set_file_mode(FileDialog::FILE_MODE_OPEN_DIR);
		_folder_dialog->connect("dir_selected", callable_mp(this, &FindInFilesDialog::_on_folder_selected));
		add_child(_folder_dialog);
		gc->add_child(hbc);
	}
	Label *filter_label = memnew(Label);
	filter_label->set_text(TTR("Filters:"));
	filter_label->set_tooltip_text(TTR("Include the files with the following extensions. Add or remove them in ProjectSettings."));
	gc->add_child(filter_label);
	_filters_container = memnew(HBoxContainer);
	gc->add_child(_filters_container);
	_find_button = add_button(TTR("Find..."), false, "find");
	_find_button->set_disabled(true);
	_replace_button = add_button(TTR("Replace..."), false, "replace");
	_replace_button->set_disabled(true);
	Button *cancel_button = get_ok_button();
	cancel_button->set_text(TTR("Cancel"));
	_mode = SEARCH_MODE;
}
void FindInFilesDialog::set_search_text(String text) {