This patch moves the GetBudgetByOrderNumber() test from
Budgets.t to Acquisition.t, thereby making it easier to
test without doing a direct SQL insert into the aqorders table.
To test:
[1] Verify that prove -v t/db_dependent/Budgets.t passes
[2] Verify that prove -v t/db_dependent/Acquisition.t passes
Signed-off-by: Galen Charlton <gmc@esilibrary.com>