message: Enable sent receipt for poll start events
diff: @@ -322,7 +322,7 @@ export class UnwrappedEventTile extends React.Component<EventTileProps, IState>
  // events and pretty much anything that can't be sent by the composer as a message. For
  // those we rely on local echo giving the impression of things changing, and expect them
  // to be quick.
  - const simpleSendableEvents = [EventType.Sticker, EventType.RoomMessage, EventType.RoomMessageEncrypted];
  + const simpleSendableEvents = [EventType.Sticker, EventType.RoomMessage, EventType.RoomMessageEncrypted, EventType.PollStart];
  if (!simpleSendableEvents.includes(this.props.mxEvent.getType() as EventType)) return false;
  // Default case
  