Remove useless casts in format arguments

Remove useless casts in format arguments

There were a number of useless casts in format arguments, either
where the input to the cast was already in the right type, or
seemingly uselessly casting between types instead of just using the
right format placeholder to begin with.

Reviewed-by: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/07fa29f9-42d7-4aac-8834-197918cbbab6%40eisentraut.org