Bug 22349: Remove overzealous database deletions from test

Bug 22349: Remove overzealous database deletions from test

For no apparent reason a whole lot of data was being deleted inside a
transaction for each of the subtests in Koha/Acquisitions/Booksellers.t

This patch simply remove the deletions. To test, run the test before and
after applying the patch and they should all continue to pass.. If you
have a large number of booksellers, baskets, orders or subscriptions in
your database you may also see an decrease in the time it takes to run
the test.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>