Bug 35788: Simplify code

Bug 35788: Simplify code

We should not load DateUtils and deal with DateTime objects and
formatting when we can use the DB for it, using \'NOW()' should be
enough.

This patch makes that change. To test:

1. Apply the previous patches
2. Run:
   $ ktd --shell
  k$ prove t/db_dependent/Koha/Bookings.t
=> SUCCESS: Tests pass!
3. Apply this patch
4. Repeat 2
=> SUCCESS: Tests pass!
5. Sign off :-D

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>