message: Fix `sticky-file-header` on commits
diff: /* `.sticky-file-header` excludes native sticky header */
  .file-header:not(.sticky-file-header) {
  position: sticky;
  - top: 0;
  - /* Same as `.sticky-file-header.is-stuck */
  - z-index: 6;
  -}
  -
  -/* Same as `.sticky-file-header.has-open-dropdown` */
  -.file-header.has-open-dropdown:not(.sticky-file-header) {
  - z-index: 10;
  + top: 60px;
  }
  .notification-shelf ~ .application-main .file-header:not(.sticky-file-header) {
  - top: 69px;
  + top: 129px;
  }
  