ext/pdo: update pdo_set_fetch_mode_errors expect for GH-20214

The GH-20214 setFetchMode fix (#21434) now rejects
FETCH_CLASSTYPE|FETCH_PROPS_LATE when the base fetch mode is not
FETCH_CLASS. The expected output for Mode 16 in the second loop
had not been updated to reflect the stricter validation, causing
common.phpt failures across all PDO drivers after the fix merged
up to PHP-8.5.

Author: iliaal

ext/pdo/tests/pdo_set_fetch_mode_errors.phpt

@@ -82,7 +82,7 @@ ValueError: PDOStatement::setFetchMode(): Argument #1 ($mode) cannot use PDO::FE
 Mode: 15
 ValueError: PDOStatement::setFetchMode(): Argument #1 ($mode) cannot use PDO::FETCH_CLASSTYPE, PDO::FETCH_PROPS_LATE, or PDO::FETCH_SERIALIZE fetch flags with a fetch mode other than PDO::FETCH_CLASS
 Mode: 16
-bool(true)
+ValueError: PDOStatement::setFetchMode(): Argument #1 ($mode) cannot use PDO::FETCH_CLASSTYPE, PDO::FETCH_PROPS_LATE, or PDO::FETCH_SERIALIZE fetch flags with a fetch mode other than PDO::FETCH_CLASS
 ValueError: PDOStatement::setFetchMode(): Argument #1 ($mode) cannot use PDO::FETCH_CLASSTYPE, PDO::FETCH_PROPS_LATE, or PDO::FETCH_SERIALIZE fetch flags with a fetch mode other than PDO::FETCH_CLASS
 ValueError: PDOStatement::setFetchMode(): Argument #1 ($mode) must be a bitmask of PDO::FETCH_* constants
 ValueError: PDOStatement::setFetchMode(): Argument #1 ($mode) PDO::FETCH_FUNC can only be used with PDOStatement::fetchAll()