message: put display name in user pill text fallback instead of mxid
diff: @@ -54,7 +54,7 @@ export function textSerialize(model) {
  return text + part.text;
  case "room-pill":
  case "user-pill":
  - return text + `${part.resourceId}`;
  + return text + `${part.text}`;
  }
  }, "");
  }
  