Adjust interval-addition test so that it won't fail on DST transition days.

Strange that we missed this DST dependence while fixing the others.

src/test/regress/expected/horology.out

@@ -855,11 +855,11 @@ SELECT time with time zone '02:30-08' + interval '36:01' AS "14:31:00-08";
 -- SELECT time with time zone '01:30' + interval '02:01' AS "03:31:00-08";
 -- SELECT time with time zone '03:30' + interval '1 month 04:01' AS "07:31:00-08";
 -- Try the following two tests instead, as a poor substitute
-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";
- 03:31:00 
+SELECT CAST(CAST(date 'today' + time with time zone '05:30'
+            + interval '02:01' AS time with time zone) AS time) AS "07:31:00";
+ 07:31:00 
 ----------
- 03:31:00
+ 07:31:00
 (1 row)
 
 SELECT CAST(cast(date 'today' + time with time zone '03:30'

src/test/regress/sql/horology.sql

@@ -153,8 +153,8 @@ SELECT time with time zone '02:30-08' + interval '36:01' AS "14:31:00-08";
 -- SELECT time with time zone '03:30' + interval '1 month 04:01' AS "07:31:00-08";
 -- Try the following two tests instead, as a poor substitute
 
-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 '05:30'
+            + interval '02:01' AS time with time zone) AS time) AS "07:31:00";
 
 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";