remove write lock during backup (#2033)

* remove write lock during backup

* remove whole line

backend/src/backup/backup_bulk.rs

@@ -358,11 +358,6 @@ async fn perform_backup<Db: DbHandle>(
             .await;
 
         let mut tx = db.begin().await?;
-        crate::db::DatabaseModel::new()
-            .package_data()
-            .idx(&package_id)
-            .lock(&mut tx, LockType::Write)
-            .await?;
 
         installed_model.lock(&mut tx, LockType::Write).await?;