Bug 889207 - [leo-pre-iot-br] [SMS] The message received before 12:00(AM) midnight is shown as TODAY in thread_list - r=gnarf

The message received before 12:00(AM) midnight is shown as TODAY
in thread_list

This patch triggers updateTimeHeaders on the next minute boundary,
instead of a 50 second poll.

Closes gh-10952
(cherry picked from commit 6ee87446f18ba034353ebeca94d5ee48be3b179d)