Remove useless casts

Peter Eisentraut <peter@eisentraut.org>

Commit: d1cb4e9f92c3db5c8fb52ccd1d502c73ffcc47e0
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-11-16T15:01:06Z
Releases: 16.0
Remove useless casts

Maybe these are left from when PageGetItem() was a macro, but now they
are clearly useless.

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