Fix expected results

Author: alamb

datafusion/sqllogictest/test_files/interval.slt

@@ -44,7 +44,7 @@ Interval(MonthDayNano) Interval(MonthDayNano)
 query ?
 select interval '5' years
 ----
-5.000000000 secs
+60 mons
 
 
 # check all different kinds of intervals
@@ -61,7 +61,7 @@ select interval '5' month
 query ?
 select interval '5' months
 ----
-5.000000000 secs
+5 mons
 
 query ?
 select interval '5' week
@@ -83,7 +83,7 @@ select interval '5' hour
 query ?
 select interval '5' hours
 ----
-5.000000000 secs
+5 hours
 
 query ?
 select interval '5' minute