swift: fix parsing of X-Object-Manifest
swift: fix parsing of X-Object-Manifest

Before this change we forgot to URL decode the X-Object-Manifest in a dynamic large object.

This problem was introduced by 2fe8285f89b494ea "swift: reserve
segments of dynamic large object when delete objects in container what
was enabled versioning."

ncw/rclone,ncw/rclone,ncw/rclone,ncw/rclone