message: fix contentUpload
diff: @@ -912,7 +912,7 @@ export class DiscordBot {
  const content = await Util.DownloadFile(attachment.url);
  const fileMime = content.mimeType || mime.getType(attachment.filename)
  || "application/octet-stream";
  - const mxcUrl = await this.bridge.botIntent.underlyingClient.uploadContent(
  + const mxcUrl = await intent.underlyingClient.uploadContent(
  content.buffer,
  fileMime,
  attachment.filename,
  