Grids: Add Default scrollByThumb Value for Desktop (#32243)

Author: arman-boyakhchyan

packages/devextreme/js/common/grids.d.ts

@@ -3101,6 +3101,7 @@ export interface ScrollingBase {
   /**
    * @docid GridBaseOptions.scrolling.scrollByThumb
    * @default false
+   * @default true &for(desktop)
    * @public
    */
   scrollByThumb?: boolean;