Fixup various new-to-v18 usages of appendPQExpBuffer

David Rowley <drowley@postgresql.org>

Commit: 3fae25cbb35aa885c411fb51f55a64bb80dc5844
Author: David Rowley <drowley@postgresql.org>
Date: 2025-04-16T23:37:55Z
Releases: 18.0
Fixup various new-to-v18 usages of appendPQExpBuffer

Use appendPQExpBufferStr when there are no parameters and
appendPQExpBufferChar when the string length is 1.

Author: David Rowley <drowleyml@gmail.com>
Discussion: https://postgr.es/m/CAApHDvoARMvPeXTTC0HnpARBHn-WgVstc8XFCyMGOzvgu_1HvQ@mail.gmail.com

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