Fix regression where today's tasks don't appear between 00:00 and 01:00.
Summary:
(or longer for people further east than GMT+1...)
Of course the other solution is to go to bed *before* looking at
today's task, I totally agree :)
Test Plan: Starting zanshin just after midnight, now today's tasks appear.
Reviewers: ervin, mlaurent
Reviewed By: ervin
Subscribers: Zanshin
Differential Revision: https://phabricator.kde.org/D9095