message: use mxid for user pill in command
diff: @@ -187,6 +187,10 @@ export default class SendMessageComposer extends React.Component {
  async _runSlashCommand() {
  const commandText = this.model.parts.reduce((text, part) => {
  + // use mxid to textify user pills in a command
  + if (part.type === "user-pill") {
  + return text + part.resourceId;
  + }
  return text + part.text;
  }, "");
  const cmd = processCommandInput(this.props.room.roomId, commandText);
  