Fix oci pull progress reporting

Comparing the code in flatpak-utils.c:progress_cb,
we need to set bytes-transferred for the total amount
of data that has been transferred so far. The value
we were setting so far, fetched-delta-part-size, refers
to the size of the objects we already have locally, and
is subtracted from the total, which explains oci progress
running backwards.

Closes: #2392

Closes: #2400
Approved by: matthiasclasen
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