ical4j's `DatePropertyRule` fails to convert to UTC

[cketti]

An edge case behavior of DatePropertyRule changed between ical4j 3.x and 4.x.
We're using DatePropertyRule in ICalPreprocessor.

See ical4j/ical4j#868
See 0e442b6#diff-23e756e5ca13141065c8c527b22fc00da74ae6ec226ed273fffcc1da22ffd518R246