Bug 15084: Replace C4::Budgets::GetCurrencies with Koha::Acquisition::Currencies...

 Bug 15084: Replace C4::Budgets::GetCurrencies with Koha::Acquisition::Currencies->search

Most part of the code here is unnecessary complex. We should selected
the currency if it is selected, that's all :)

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>