Bug 31631: Unit tests

Bug 31631: Unit tests

Test plan:
Run amended Budgets.t test and all existing unchanged Acquisition tests in koha-shell
- sudo koha-shell <instance>
- prove t/db_dependent/Budgets.t
- prove t/db_dependent/Acquisition
- prove t/db_dependent/Acquisition.t
- prove t/db_dependent/Budgets

Sponsored-by: Waikato Institute of Technology, New Zealand
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Bug 31631: (follow-up) Fixes for failing unit test t/db_dependent/Budgets.t

Test plan:
1. Set CalculateFundValuesIncludingTax = 'Include'

2. Run Budgets.t unit test
sudo koha-shell kohadev
prove t/db_dependent/Budgets.t

3. Set CalculateFundValuesIncludingTax = 'Exclude'

4. Run Budgets.t unit test
sudo koha-shell kohadev
prove t/db_dependent/Budgets.t

Sponsored-By: Waikato Institute of Technology, New Zealand
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>