Adds GetBudgetHierarchy to the functions called by C4::Budgets
Plan :
1. Create a budget with a random amount, save it.
2. Try to close the budget.
3. You should get an Error Trace.
4. Apply the patch
5. Close the budget again
6. It should work.
Signed-off-by: Joonas Kylmälä <joonas.kylmala@iki.fi>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
