remove useless code in DeletButtonStories

Author: adguernier

packages/ra-ui-materialui/src/button/DeleteButton.stories.tsx

@@ -1,55 +1,37 @@
 import * as React from 'react';
 import { createTheme } from '@mui/material';
-import type { PaletteColor } from '@mui/material';
 import { DeleteButton } from './DeleteButton';
-import { Form } from 'ra-core';
 import { AdminContext } from '../AdminContext';
 
 export default { title: 'ra-ui-materialui/button/DeleteButton' };
 
 export const Basic = () => (
     <AdminContext>
-        <Form record={{ id: 1 }}>
-            <DeleteButton label="Delete" />
-        </Form>
+        <DeleteButton label="Delete" record={{ id: 1 }} />
+    </AdminContext>
+);
+
+export const Pessimistic = () => (
+    <AdminContext>
+        <DeleteButton
+            mutationMode="pessimistic"
+            record={{ id: 1 }}
+            label="Delete"
+            resource="post"
+        />
     </AdminContext>
 );
 
 export const WithUserDefinedPalette = () => (
     <AdminContext theme={theme}>
-        <Form record={{ id: 1 }}>
-            <DeleteButton label="Delete" />
-        </Form>
+        <DeleteButton label="Delete" record={{ id: 1 }} />
     </AdminContext>
 );
 
-/**
- * Adding new theme tokens to the palette
- * @see https://mui.com/material-ui/experimental-api/css-theme-variables/customization/#typescript
- */
 const theme = createTheme({
     palette: {
         error: {
-            main: '#FDDBD3',
+            main: '#07BA8F',
         },
     },
 });
-
-declare module '@mui/material/styles' {
-    interface Palette {
-        userDefined?: PaletteColor;
-    }
-    interface PaletteOptions {
-        userDefined?: PaletteColor;
-    }
-}
-
-/**
- * Adding new theme tokens to the Button
- * https://mui.com/material-ui/customization/theme-components/#creating-new-component-variants
- */
-declare module '@mui/material/Button' {
-    interface ButtonPropsColorOverrides {
-        userDefined: true;
-    }
-}