修复系统配置不能保存的BUG

@@ -140,7 +140,7 @@ class Config extends Backend
                             $value = is_array($value) ? implode(',', $value) : $value;
                         }
                         $v['value'] = $value;
-                        $configList[] = $v;
+                        $configList[] = $v->toArray();
                     }
                 }
                 $this->model->allowField(true)->saveAll($configList);