Fix last (?) problem with sensitivity to daylight savings time status

when running the regression test. Reported by Tom Lane.

src/test/regress/expected/horology.out

@@ -551,7 +551,7 @@ SELECT CAST(CAST(date 'today' + time with time zone '01:30'
  03:31:00
 (1 row)
 
-SELECT CAST(cast(date 'today' + time with time zone '03:30-08'
+SELECT CAST(cast(date 'today' + time with time zone '03:30'
   + interval '1 month 04:01' as timestamp without time zone) AS time) AS "07:31:00";
  07:31:00 
 ----------

src/test/regress/sql/horology.sql

@@ -90,7 +90,7 @@ SELECT time with time zone '02:30-08' + interval '36:01' AS "14:31:00-08";
 SELECT CAST(CAST(date 'today' + time with time zone '01:30'
             + interval '02:01' AS time with time zone) AS time) AS "03:31:00";
 
-SELECT CAST(cast(date 'today' + time with time zone '03:30-08'
+SELECT CAST(cast(date 'today' + time with time zone '03:30'
   + interval '1 month 04:01' as timestamp without time zone) AS time) AS "07:31:00";
 
 SELECT interval '04:30' - time with time zone '01:02-05' AS "20:32:00-05";