message: Special case redaction event sending from widgets per MSC2762
  Fixes
  See
diff: @@ -129,6 +129,9 @@ export class StopGapWidgetDriver extends WidgetDriver {
  if (stateKey !== null) {
  // state event
  r = await client.sendStateEvent(roomId, eventType, content, stateKey);
  + } else if (eventType === EventType.RoomRedaction) {
  + // special case: extract the `redacts` property and call redact
  + r = await client.redactEvent(roomId, content['redacts']);
  } else {
  // message event
  r = await client.sendEvent(roomId, eventType, content);
  