### 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

--
switch (p_what) {
		case NOTIFICATION_VISIBILITY_CHANGED: {
			if (is_visible()) {
				
				_search_text_line_edit->call_deferred(SNAME("grab_focus"));
				_search_text_line_edit->select_all();
				
				for (int i = 0; i < _filters_container->get_child_count(); i++) {
					_filters_container->get_child(i)->queue_free();
				}
				Array exts = GLOBAL_GET("editor/script/search_in_file_extensions");
				for (int i = 0; i < exts.size(); ++i) {
					CheckBox *cb = memnew(CheckBox);
					cb->set_text(exts[i]);
					if (!_filters_preferences.has(exts[i])) {
						_filters_preferences[exts[i]] = true;
					}
					cb->set_pressed(_filters_preferences[exts[i]]);
					_filters_container->add_child(cb);
				}
			}
		} break;
	}
}
void FindInFilesDialog::_on_folder_button_pressed() {