docs(Picker): fix popup content is inconsistent with the Chinese version (#12300)

* fix(Picker): fix  bug the content of the popup window is not consistent with the Chinese version under the English version

* fix(Picker): Fix the issue that scroll wheel selection list is not supported on pc

* fix(Picker): Rollback of new commits last one

packages/vant/src/picker/demo/index.vue

@@ -44,8 +44,7 @@ const t = useTranslate({
     multipleColumns: 'Multiple Columns',
     customChildrenKey: 'Custom Columns Fields',
     customChildrenColumns: customKeyColumns['en-US'],
-    toastContent: (value: string, index: number) =>
-      `Value: ${value}, Index：${index}`,
+    toastContent: (value: string) => `Value: ${value}`,
   },
 });