Fix TIMESTAMP_NTZ precision in CTAS test canonical form

The canonical form was incorrectly dropping the precision specifier.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: JanKaul

tests/sqlparser_snowflake.rs

@@ -48,7 +48,7 @@ fn test_snowflake_create_table() {
 fn test_snowflake_create_table_timestamp_ntz_precision_ctas_values() {
     let sql = "CREATE TABLE t (x TIMESTAMP_NTZ(3)) AS SELECT * FROM VALUES ('2025-04-09T21:11:23')";
     let canonical =
-        "CREATE TABLE t (x TIMESTAMP_NTZ) AS SELECT * FROM (VALUES ('2025-04-09T21:11:23'))";
+        "CREATE TABLE t (x TIMESTAMP_NTZ(3)) AS SELECT * FROM (VALUES ('2025-04-09T21:11:23'))";
     snowflake().one_statement_parses_to(sql, canonical);
 }