Bug 18999: Add regression tests

Bug 18999: Add regression tests

Added regression test for GetBudgetSpent() and GetBudgetOrdered() into
the t/db_dependent/Budgets.t

Test plan:
1. Go into your koha-shell

2. set the PERL5LIB variable

3. Run t/db_dependent/Budgets.t

All tests should pass

Sponsored-by: Catalyst IT
Signed-off-by: Lee Jamison <ldjamison@marywood.edu>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>