Bug 16423: Fix t/db_dependent/www/batch.t so it matches new layout

Bug 16423: Fix t/db_dependent/www/batch.t so it matches new layout

This patch adjusts batch.t so it matches the use of datatables on the
'Manage staged records' page, and small layout changes already fixed
on search_utf8.t.

The tests are slightly modified so they actually test interesting stuff.
Some were passing only because an undefined value was passed.

To test:
- On master, run
  $ prove t/db_dependent/www/batch.t
=> FAIL: Tests fail notably
- Apply the patch
- Run:
  $ prove t/db_dependent/www/batch.t
=> SUCCESS: Notice tests now pass.
- Sign off :-D

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Test pass

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>