Fixed bug discovered by better type on map().

Rev: lib/modules/Calendar.pmod/TimeRanges.pmod:1.6

lib/modules/Calendar.pmod/TimeRanges.pmod

@@ -1128,7 +1128,7 @@ class cSuperTimeRange
    TimeRange set_timezone(string|Timezone tz)
    {
 // fixme?
-      return `|(map(parts,"set_timezone",tz));
+      return `|(@map(parts,"set_timezone",tz));
    }
 }