make_model: fix typo

src/components/Table.js

@@ -12,7 +12,7 @@ export default initial_vnode => {
 	let columns = initial_vnode.attrs.columns
 	if (!columns) {
 		if (model.configs().selects) {
-			_columns = model.configs().selects.map(select => ({
+			columns = model.configs().selects.map(select => ({
 				label: select.alias || select.label
 			}))
 		}