Use default time zone
Use default time zone

In this commit: https://github.com/alphagov/collections/pull/1985/commits/35e3cb4850ea72b43f64dd5b207d4f3c4369ad74
we had to manually set the time zone to London, so that the future COVID restrictions would
update in the postcode checker at one minute past midnight as expected and not at 1:01am.

Ideally at the time, we would have set the default time zone to "London" for the whole app, but too many unrelated
tests needed to be fixed.  However,  that has all been fixed in https://github.com/alphagov/collections/pull/1997
so we can remove our work around.

alphagov/collections,alphagov/collections,alphagov/collections,alphagov/collections