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Before this change the b2 backend wasn't writing the metadata to the
object properly after a multipart upload.
The symptom of this was that sometimes it would give the error:
corrupted on transfer: sizes differ XXX vs 0
This was fixed by returning the metadata in the chunk writer and setting it in Update.
See: https://forum.rclone.org/t/multipart-upload-to-b2-sometimes-failing-with-corrupted-on-transfer-sizes-differ/41829