message: Fix branch dropdown position in `clean-conversation-headers`
diff: .gh-header.issue .rgh-clean-conversation-headers relative-time {
  display: none;
  }
  +
  +/* Fixes vertical alignment of base branch dropdown #5598 */
  +.rgh-clean-conversation-headers .commit-ref-dropdown {
  + margin-top: -2px !important;
  +}
  