DROOLS-643 Spreadsheet cell value by XLS function results in decimal fra...

...ction

- Test case

This issue has been already fixed in master by another BZ

- https://bugzilla.redhat.com/show_bug.cgi?id=1145841
- https://github.com/droolsjbpm/drools/commit/68e510b6d

So this test case runs fine in master.