message: fix: sorting on "Modified By" in chart table
  * initial fix
  * Update ChartList.tsx
  change sort to first name
diff: @@ -285,7 +285,7 @@ function ChartList(props: ChartListProps) {
  </a>
  ),
  Header: t('Modified by'),
  - accessor: 'last_saved_by',
  + accessor: 'last_saved_by.first_name',
  size: 'xl',
  },
  {
  