message: Fix PR label for stale view
diff: @@ -440,7 +440,7 @@ td.js-line-comments:last-child .timeline-comment-actions .add-reaction-popover::
  .stale-files-tab .stale-files-tab-link {
  font-size: 14px;
  }
  -.stale-files-tab-link::before {
  +.subset-files-tab .stale-files-tab-link::before {
  content: 'Subset of changes. ';
  font-weight: normal;
  }
  