Fix two database errors (#3483)

* Fixes error when an admin tries transferring project ownership
* Fixes error when trying to delete a user when they previously have a transaction

Co-authored-by: Jai Agrawal <18202329+Geometrically@users.noreply.github.com>

apps/labrinth/src/database/models/user_item.rs

@@ -657,6 +657,18 @@ impl User {
             .execute(&mut **transaction)
             .await?;
 
+            sqlx::query!(
+                "
+                UPDATE charges
+                SET user_id = $1
+                WHERE user_id = $2
+                ",
+                deleted_user as UserId,
+                id as UserId,
+            )
+            .execute(&mut **transaction)
+            .await?;
+
             sqlx::query!(
                 "
                 DELETE FROM user_backup_codes