fix(AnalyticalTable): calculate scrollbar width only if table is scrollable (#470)

Fixes #467

Author: MarcusNotheis

packages/main/src/components/AnalyticalTable/demo/demo.stories.tsx renamed to packages/main/src/components/AnalyticalTable/AnalyticalTable.stories.tsx

@@ -8,7 +8,7 @@ import { TableSelectionMode } from '@ui5/webcomponents-react/lib/TableSelectionM
 import { TextAlign } from '@ui5/webcomponents-react/lib/TextAlign';
 import { Title } from '@ui5/webcomponents-react/lib/Title';
 import React from 'react';
-import generateData from './generateData';
+import generateData from './demo/generateData';
 
 const columns = [
   {