LibJS: Handle PlainTime objects in ToTemporalCalendar

Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp

@@ -12,6 +12,7 @@
 #include <LibJS/Runtime/Temporal/CalendarConstructor.h>
 #include <LibJS/Runtime/Temporal/PlainDate.h>
 #include <LibJS/Runtime/Temporal/PlainDateTime.h>
+#include <LibJS/Runtime/Temporal/PlainTime.h>
 #include <LibJS/Runtime/Value.h>
 
 namespace JS::Temporal {
@@ -297,7 +298,9 @@ Object* to_temporal_calendar(GlobalObject& global_object, Value temporal_calenda
             return &static_cast<PlainDate&>(temporal_calendar_like_object).calendar();
         if (is<PlainDateTime>(temporal_calendar_like_object))
             return &static_cast<PlainDateTime&>(temporal_calendar_like_object).calendar();
-        // TODO: The rest of the Temporal built-ins (PlainMonthDay, PlainTime, PlainYearMonth, ZonedDateTime)
+        if (is<PlainTime>(temporal_calendar_like_object))
+            return &static_cast<PlainTime&>(temporal_calendar_like_object).calendar();
+        // TODO: The rest of the Temporal built-ins (PlainMonthDay, PlainYearMonth, ZonedDateTime)
 
         // b. If ? HasProperty(temporalCalendarLike, "calendar") is false, return temporalCalendarLike.
         auto has_property = temporal_calendar_like_object.has_property(vm.names.calendar);