fix view.LFTPD->changedModel(): define initial `mdata.prests`
fix view.LFTPD->changedModel(): define initial `mdata.prests`

or first ever check skips updates of status images

Signed-off-by: Oleg Verych <a5ce24b76737c0ca6b8faa55c4f938064a1695cf@gmail.com>

suprojs/suprolftpd,suprojs/suprolftpd