message: Use the event sender instead of event ID for viaServers off a tombstone
  Fixes
diff: @@ -327,9 +327,9 @@ export default class MessageComposer extends React.Component {
  event_id: createEventId,
  room_id: replacementRoomId,
  - // Try to join via the server that sent the event. This converts $something:example.org
  - // into a server domain by splitting on colons and ignoring the first entry ("$something").
  - via_servers: [this.state.tombstone.getId().split(':').splice(1).join(':')],
  + // Try to join via the server that sent the event. This converts @something:example.org
  + // into a server domain by splitting on colons and ignoring the first entry ("@something").
  + via_servers: [this.state.tombstone.getSender().split(':').splice(1).join(':')],
  });
  }
  