lib/batcher: log when committing uploads has finished - fixes #5564

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On shutdown the batcher logged "Committing uploads - please wait..."
but nothing once the commit had completed, so the log looked as if
rclone had stopped part way through. Log "Committing uploads - done"
when the pending batches have been committed.

This affects the backends which use the batcher, dropbox and
googlephotos.

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