message: fix(legacy-table): adjust sort icon position
diff: margin-top: 0.5em;
  }
  -.superset-legacy-chart-table thead th.sorting:after,
  -table.table thead th.sorting_asc:after,
  -table.table thead th.sorting_desc:after {
  - top: 0px;
  +.superset-legacy-chart-table table.table thead th.sorting:after,
  +.superset-legacy-chart-table table.table thead th.sorting_asc:after,
  +.superset-legacy-chart-table table.table thead th.sorting_desc:after {
  + top: auto;
  + bottom: 6px;
  }
  .superset-legacy-chart-table td {
  white-space: pre-wrap;
  