chore: typo in date command

salt/dom0/files/backup/qusal.conf.example

@@ -17,7 +17,7 @@ compression: true
 passphrase_text: my-password
 
 destination_vm: backup-ssh
-destination_path: ssh backup 'cat | tee /dir/qubes-backup-$(data +%Y-%m-%d-%H-%M-%S) >/dev/null'
+destination_path: ssh backup 'cat | tee /dir/qubes-backup-$(date +%Y-%m-%d-%H-%M-%S) >/dev/null'
 
 ## $ qvm-backup-find-last backup-ssh /dir/ 'ssh backup'
 ## $ qvm-backup-restore --verify-only -d backup-ssh \