remove unused import

Author: adguernier

packages/ra-ui-materialui/src/button/DeleteWithConfirmButton.tsx

@@ -1,7 +1,5 @@
 import React, { Fragment, ReactEventHandler, ReactElement } from 'react';
-import { styled } from '@mui/material/styles';
 import PropTypes from 'prop-types';
-import { alpha } from '@mui/material/styles';
 import ActionDelete from '@mui/icons-material/Delete';
 import clsx from 'clsx';
 import inflection from 'inflection';

packages/ra-ui-materialui/src/button/DeleteWithUndoButton.tsx

@@ -1,8 +1,6 @@
 import * as React from 'react';
-import { styled } from '@mui/material/styles';
 import { ReactElement, ReactEventHandler } from 'react';
 import PropTypes from 'prop-types';
-import { alpha } from '@mui/material/styles';
 import ActionDelete from '@mui/icons-material/Delete';
 import clsx from 'clsx';
 import { UseMutationOptions } from 'react-query';