message: Allow stickerpickers the legacy "visibility" capability
  Fixes
diff: @@ -71,6 +71,10 @@ export class StopGapWidgetDriver extends WidgetDriver {
  const stickerSendingCap = WidgetEventCapability.forRoomEvent(EventDirection.Send, EventType.Sticker).raw;
  this.allowedCapabilities.add(MatrixCapabilities.StickerSending); // legacy as far as MSC2762 is concerned
  this.allowedCapabilities.add(stickerSendingCap);
  +
  + // Auto-approve the legacy visibility capability. We send it regardless of capability.
  + // Widgets don't technically need to request this capability, but Scalar still does.
  + this.allowedCapabilities.add("visibility");
  }
  }
  