SyncDlg: Fix graphical bug

The button was partly hidden by IDC_PROG_LABEL. Also move controls up to be more space efficient.

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Update screenshots

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Update documentation

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>