fix: preserve negative timezone offsets when cloning gpx#292
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Signed-off-by: SAY-5 <say.apm35@gmail.com>
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Fixes #190. SimpleTZ.deepcopy rebuilt the tzinfo from tzname(), but tzname() emitted a malformed string for negative offsets (e.g. '-6:00') that SimpleTZ.init parsed back to a zero offset, so clone() silently dropped non-UTC timezones. This zero-pads the hour and adds the sign so tzname() round-trips, with a regression test.