Update preview.tsx

Signed-off-by: Charles de Dreuille <charles.dedreuille@gmail.com>

.storybook/preview.tsx

@@ -3,11 +3,10 @@ import addonDocs from '@storybook/addon-docs';
 import addonThemes from '@storybook/addon-themes';
 import addonLinks from '@storybook/addon-links';
 import { definePreview } from '@storybook/react-vite';
-import React, { useEffect } from 'react';
+import { useEffect } from 'react';
 import { TestApiProvider } from '@backstage/test-utils';
 import { Content, AlertDisplay } from '@backstage/core-components';
 import { apis } from './support/apis';
-import type { Decorator } from '@storybook/react-vite';
 import { useGlobals } from 'storybook/preview-api';
 import { UnifiedThemeProvider, themes } from '@backstage/theme';
 import { allModes } from './modes';
@@ -62,7 +61,7 @@ export default definePreview({
     layout: 'fullscreen',
 
     backgrounds: {
-      disabled: true,
+      disable: true,
     },
 
     controls: {