Fix old_disk_path when re-executing it

Fix old_disk_path when re-executing it after
a failed attachment migration

app/workers/hashed_storage/project_migrate_worker.rb

@@ -16,7 +16,7 @@ module HashedStorage
         project = Project.without_deleted.find_by(id: project_id)
         break unless project
 
-        old_disk_path ||= project.disk_path
+        old_disk_path ||= Storage::LegacyProject.new(project).disk_path
 
         ::Projects::HashedStorage::MigrationService.new(project, old_disk_path, logger: logger).execute
       end