Fix stop crashing with UIWidget::moveChildToIndex.
Fix stop crashing with UIWidget::moveChildToIndex.

dreamsxin/otclient,gpedro/otclient,dreamsxin/otclient,Radseq/otclient,gpedro/otclient,Cavitt/otclient_mapgen,gpedro/otclient,Radseq/otclient,Cavitt/otclient_mapgen,dreamsxin/otclient