message: Fix /join slash command via servers including room id as a via
diff: @@ -495,8 +495,7 @@ export const Commands = [
  });
  return success();
  } else if (params[0][0] === '!') {
  - const roomId = params[0];
  - const viaServers = params.splice(0);
  + const [roomId, ...viaServers] = params;
  dis.dispatch({
  action: 'view_room',
  