Add uuid to block device listing

src/system.js

@@ -311,6 +311,7 @@ async function getBlockDevices() {
             path: d.name,
             size: d.fsavail || 0,
             type: d.fstype,
+            uuid: d.uuid,
             mountpoint: d.mountpoints ? d.mountpoints[0] : d.mountpoint // we only support one mountpoint here old lsblk only exposed one via .mountpoint
         };
     });