Fix incorrect format placeholders

Peter Eisentraut <peter@eisentraut.org>

Commit: e03b807e12bbb72d53ed53502dfb2c1e063e467c
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2021-09-15T07:19:01Z
Releases: 15.0
Fix incorrect format placeholders

Also remove obsolete comments about why the 64-bit integers need to be
printed in a separate buffer.  The reason used to be portability, but
now the remaining reason is that we need the string lengths for the
progress displays.  That is evident by looking at the code right
below, so a new comment doesn't seem necessary.

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