fix：删除冗余属性

src/engine/view/grid-view8-engine.ts

@@ -9,14 +9,6 @@ import GridViewEngine from './grid-view-engine';
  */
 export default class GridView8Engine extends GridViewEngine {
 
-    /**
-     * 表格部件
-     *
-     * @type {*}
-     * @memberof GridView8Engine
-     */
-    protected grid: any;
-
     /**
      * 表格部件
      *