Fix remote backups failing

Using the latest released version of backup for FPBX v13, SSH backup fails on the remote server when a MySQL backup is involved.  It also affects v14.  The following changes to the code will fix it.  I don't have a signed CLA in place so I cannot submit a pull request myself.

bin/backup.php, line 268

$b->add_items(false);

 functions.inc/class.backup.php, line 268

 //Do not log backups initiated remotely, which causes them to fail 
($vars) ? backup_log('server -'.$s) : false;

functions.inc/class.backup.php, line 373

//Do not log backups initiated remotely, which causes them to fail
($vars) ? backup_log($message) : false;