Default value used instead of value

In the element, default value is used instead of value for determining what's been selected so on validation errors selected terms loose their selection. (For example, select some terms than use do a blank search so it'll error and the selected terms aren't selected anymore).

(Also, when that is changed and non ajax load (expand all) is used terms only on the top level are selected due to this line $value = in_array($tree[$newindex]->tid, $terms_to_expand) ? 1 : 0;).