Fix radio buttons support in ItemListEditorPlugin

This was missed in bf14a6deffe4c9b74920080851f7e4e273f66116.

editor/plugins/item_list_editor_plugin.cpp

@@ -109,7 +109,7 @@ void ItemListPlugin::_get_property_list(List<PropertyInfo> *p_list) const {
 		int flags = get_flags();
 
 		if (flags & FLAG_CHECKABLE) {
-			p_list->push_back(PropertyInfo(Variant::BOOL, base + "checkable", PROPERTY_HINT_ENUM, "No,As checkbox,As radio button"));
+			p_list->push_back(PropertyInfo(Variant::INT, base + "checkable", PROPERTY_HINT_ENUM, "No,As checkbox,As radio button"));
 			p_list->push_back(PropertyInfo(Variant::BOOL, base + "checked"));
 		}