fix(utime.c): make set_time correctly subtract TZONE_OFFSET

there were two bugs in set_time:

• TZONE_OFFSET is not multiplied by 1000, even though epic_rtc_set_milliseconds was used.
• TZONE_OFFSET is added in both time and set_time. set_time should subtract the timezone offset.

Testcase:

import utime

old = utime.time()
utime.set_time(old)
new = utime.time()

if old != new:
  print("time difference:", new - old)
  # will print 7607, or 2.11 hours with the old code
  # should print 0 or 1 at most

Looks good to me! Thanks for keeping our codebase clean.

However, I'm only a bot - so a human will still have to approve this request.

changed title from fix(utime.c): set_time incorrectly adds TZONE_OFFSET to fix(utime.c): make set_time correctly subtract TZONE_OFFSET

changed the description

This is rahix (I got ratelimited ^^): LGTM , will merge once I can log back in

changed milestone to %v1.4

merged

mentioned in commit fd1ffbc2