fix `input_update()` failed on `select()`

webiojs/src/models/input/select.ts

@@ -67,6 +67,9 @@ export class Select extends InputItem {
             if (key in ignore_keys) continue;
             input_elem.attr(key, this.spec[key]);
         }
+
+        // @ts-ignore
+        input_elem.selectpicker('refresh');
     }
 
     update_input(spec: any): any {