a bug in IO_Checklist

There was a bug in IO_Checklist.

To fix it, you need to change "for(int i=0;i<_len-1;i++)" to "for(int i=0;i<_len;i++)".

int IO_CheckList::edit(void){
  int key;
  bool done = false;
  int x = 0;
  int stat = 0;
  while(!done){
    stat = (int)_status[x];
    key =io_flag(_format, IO_Field::getRow()+1+x, IO_Field::getCol()+1,&stat,_mode);
    _status[x] = !!stat;
    switch(key){
      case DOWN_KEY:
        if(x < _len-1){
          x++;
        }
        else{
          done = true;
        }
        break;
      case UP_KEY:
        if(x > 0){
          x--;
        }
        else{
          done = true;
        }
        break;
      case ' ':

        if(_mode == Radio){
          for(int i=0;i<_len;i++){
            if(i!=x && _status[i]){
              _status[i] = false;
              io_displayflag(_format, IO_Field::getRow()+1+i,
                IO_Field::getCol()+1,0);
            }
          }
        }
        break;
      default:
        done = true;
    }
  }
  return key;
}