Deprecated "OrdersItem::Load" method prevents order loading by non-id field

Deprecated "OrdersItem::Load" method prevents order loading by non-id field. For example try to load order by string field, like "AdminComments" and it will return non-loaded object even if order should be found properly. Such odd behavior is produced by "OrdersItem::Load" method, that is no longer used since we have grid filters in orders search list.