Mark delete backup dialog as destructive (#23008)

hassio/src/backups/hassio-backups.ts

@@ -323,6 +323,7 @@ export class HassioBackups extends LitElement {
         number: this._selectedBackups.length,
       }),
       confirmText: this.supervisor.localize("backup.delete_backup_confirm"),
+      destructive: true,
     });
 
     if (!confirm) {

hassio/src/dialogs/backup/dialog-hassio-backup.ts

@@ -302,6 +302,7 @@ class HassioBackupDialog
         text: supervisor!.localize("backup.confirm_delete_text"),
         confirmText: supervisor!.localize("backup.delete"),
         dismissText: supervisor!.localize("backup.cancel"),
+        destructive: true,
       }))
     ) {
       return;