message: Fix incorrect CSS selector for `clean-notifications`
  CSS copied into file from on in is not the one with the right CSS selector, which should be `.js-notifications-group`.
diff: /* Place discussion number before the title */
  -.rgh-clean-notifications [id^='notification'] {
  +.js-notifications-group [id^='notification'] {
  flex-direction: row !important;
  }
  -
  /* Hide duplicate repository URL */
  -.rgh-clean-notifications [id^='notification'] > .d-flex > .f6 {
  +.js-notifications-group [id^='notification'] > .d-flex > .f6 {
  font-size: 0 !important;
  }
  -
  /* Size and position the discussion number */
  -.rgh-clean-notifications [id^='notification'] > .d-flex > .f6 > span {
  +.js-notifications-group [id^='notification'] > .d-flex > .f6 > span {
  display: block;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  