Remove obsolete global database_ctype_is_c.

Jeff Davis <jdavis@postgresql.org>

Commit: 844385d12e7515f3461e53728f0a9358bc35b6a5
Author: Jeff Davis <jdavis@postgresql.org>
Date: 2025-10-21T16:32:04Z
Remove obsolete global database_ctype_is_c.

Now that tsearch uses the database default locale, there's no need to
track the database CTYPE separately.

Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Discussion: https://postgr.es/m/0151ad01239e2cc7b3139644358cf8f7b9622ff7.camel@j-davis.com

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