message: Fix `clean-conversation-sidebar` leaking style
diff: }
  /* Align sidebar to the top */
  -.discussion-sidebar-item:first-child {
  +.discussion-sidebar-item.rgh-clean-sidebar:first-child {
  padding-top: 0;
  }
  -.sidebar-labels .sidebar-labels-style:first-child {
  - margin-top: 0;
  -}
  -
  /* Move message under the `Unsubscribe` button above the button */
  -.thread-subscription-status {
  +.rgh-clean-sidebar .thread-subscription-status {
  display: flex;
  flex-direction: column;
  }
  -form.thread-subscribe-form { /* `form` excludes the header */
  +.rgh-clean-sidebar form.thread-subscribe-form { /* `form` excludes the header */
  order: 1;
  }
  -.thread-subscription-status .reason {
  +.rgh-clean-sidebar .thread-subscription-status .reason {
  margin: 0 0 10px !important;
  }
  