Fix a mistake in itemlist multiselect signal

scene/gui/item_list.cpp

@@ -502,7 +502,7 @@ void ItemList::_gui_input(const Ref<InputEvent> &p_event) {
 					bool selected = !items[j].selected;
 					select(j, false);
 					if (selected)
-						emit_signal("multi_selected", i, true);
+						emit_signal("multi_selected", j, true);
 				}
 
 				if (mb->get_button_index() == BUTTON_RIGHT) {