message: Fix pagination on channel listing
diff: <app-pagination
  :pager="true"
  :items-per-page="perPage"
  - :total-items="channel.listableTopicsCount"
  + :total-items="listableTopicsCount"
  :current-page="currentPage"
  @pagechange="Scroll.to( 'forum-topics-list', { animate: false } )"
  />
  