core: fix v5.8 backups not restoring due to changed item ids (#1303)

* core: back restore repaired due to version change
Signed-off-by: Muhammad Ali <alihamuh@gmail.com>

packages/core/database/migrator.js

@@ -38,7 +38,7 @@ class Migrator {
       const index = (await collection.index()) || [];
       for (var i = 0; i < index.length; ++i) {
         let id = index[i];
-        let item = get(id);
+        let item = get(id, collection.dbCollection.collectionName);
         if (!item) {
           continue;
         }