Attaché Payroll: Express Leave public holidays should reduce leave days taken accordingly

When entering a Leave request in Express Leave the number of leave days shown should be reduced accordingly if there are any public holidays within this date range.
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For an example: If two weeks of leave is requested for a full-time worker then the number of leave days should show as 10. If a Public Holiday falls within the leave date range, then the leave days should be reduced again by the public holiday. In this case it should show 9 days of leave only.